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/**
 *Submitted for verification at Etherscan.io on 2020-09-22
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/math/SafeMath.sol

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/utils/EnumerableSet.sol

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: contracts/vaults/ValueLiquidityToken.sol

// Value Liquidity (VALUE) with Governance Alpha
contract ValueLiquidityToken is ERC20 {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    IERC20 public yfv;

    address public governance;
    uint256 public cap;
    uint256 public yfvLockedBalance;
    mapping(address => bool) public minters;

    event Deposit(address indexed dst, uint amount);
    event Withdrawal(address indexed src, uint amount);

    constructor (IERC20 _yfv, uint256 _cap) public ERC20("Value Liquidity", "VALUE") {
        governance = msg.sender;
        yfv = _yfv;
        cap = _cap;
    }

    function mint(address _to, uint256 _amount) public {
        require(msg.sender == governance || minters[msg.sender], "!governance && !minter");
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    function burn(uint256 _amount) public {
        _burn(msg.sender, _amount);
        _moveDelegates(_delegates[msg.sender], address(0), _amount);
    }

    function burnFrom(address _account, uint256 _amount) public {
        uint256 decreasedAllowance = allowance(_account, msg.sender).sub(_amount, "ERC20: burn amount exceeds allowance");
        _approve(_account, msg.sender, decreasedAllowance);
        _burn(_account, _amount);
        _moveDelegates(_delegates[_account], address(0), _amount);
    }

    function setGovernance(address _governance) public {
        require(msg.sender == governance, "!governance");
        governance = _governance;
    }

    function addMinter(address _minter) public {
        require(msg.sender == governance, "!governance");
        minters[_minter] = true;
    }

    function removeMinter(address _minter) public {
        require(msg.sender == governance, "!governance");
        minters[_minter] = false;
    }

    function setCap(uint256 _cap) public {
        require(msg.sender == governance, "!governance");
        require(_cap.add(yfvLockedBalance) >= totalSupply(), "_cap (plus yfvLockedBalance) is below current supply");
        cap = _cap;
    }

    function deposit(uint256 _amount) public {
        yfv.safeTransferFrom(msg.sender, address(this), _amount);
        yfvLockedBalance = yfvLockedBalance.add(_amount);
        _mint(msg.sender, _amount);
        _moveDelegates(address(0), _delegates[msg.sender], _amount);
        Deposit(msg.sender, _amount);
    }

    function withdraw(uint256 _amount) public {
        yfvLockedBalance = yfvLockedBalance.sub(_amount, "There is not enough locked YFV to withdraw");
        yfv.safeTransfer(msg.sender, _amount);
        _burn(msg.sender, _amount);
        _moveDelegates(_delegates[msg.sender], address(0), _amount);
        Withdrawal(msg.sender, _amount);
    }

    // This function allows governance to take unsupported tokens out of the contract.
    // This is in an effort to make someone whole, should they seriously mess up.
    // There is no guarantee governance will vote to return these.
    // It also allows for removal of airdropped tokens.
    function governanceRecoverUnsupported(IERC20 _token, address _to, uint256 _amount) external {
        require(msg.sender == governance, "!governance");
        if (_token == yfv) {
            uint256 yfvBalance = yfv.balanceOf(address(this));
            require(_amount <= yfvBalance.sub(yfvLockedBalance), "cant withdraw more then stuck amount");
        }
        _token.safeTransfer(_to, _amount);
    }

    /**
     * @dev See {ERC20-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - minted tokens must not cause the total supply to go over the cap.
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        if (from == address(0)) {// When minting tokens
            require(totalSupply().add(amount) <= cap.add(yfvLockedBalance), "ERC20Capped: cap exceeded");
        }
    }

    // Copied and modified from YAM code:
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
    // Which is copied and modified from COMPOUND:
    // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol

    /// @dev A record of each accounts delegate
    mapping(address => address) internal _delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of states for signing / validating signatures
    mapping(address => uint) public nonces;

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator)
    external
    view
    returns (address)
    {
        return _delegates[delegator];
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name())),
                getChainId(),
                address(this)
            )
        );

        bytes32 structHash = keccak256(
            abi.encode(
                DELEGATION_TYPEHASH,
                delegatee,
                nonce,
                expiry
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                structHash
            )
        );
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "VALUE::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "VALUE::delegateBySig: invalid nonce");
        require(now <= expiry, "VALUE::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account)
        external
        view
        returns (uint256)
    {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber)
        external
        view
        returns (uint256)
    {
        require(blockNumber < block.number, "VALUE::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee)
        internal
    {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying VALUEs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    )
        internal
    {
        uint32 blockNumber = safe32(block.number, "VALUE::_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2 ** 32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly {chainId := chainid()}
        return chainId;
    }
}

// File: contracts/vaults/ValueVaultMaster.sol

/*
 * Here we have a list of constants. In order to get access to an address
 * managed by ValueVaultMaster, the calling contract should copy and define
 * some of these constants and use them as keys.
 * Keys themselves are immutable. Addresses can be immutable or mutable.
 *
 * Vault addresses are immutable once set, and the list may grow:
 * K_VAULT_WETH = 0;
 * K_VAULT_ETH_USDC_UNI_V2_LP = 1;
 * K_VAULT_ETH_WBTC_UNI_V2_LP = 2;
 */

/*
 * ValueVaultMaster manages all the vaults and strategies of our Value Vaults system.
 */
contract ValueVaultMaster {
    address public governance;

    address public bank;
    address public minorPool;
    address public profitSharer;

    address public govToken; // VALUE
    address public yfv; // When harvesting, convert some parts to YFV for govVault
    address public usdc; // we only used USDC to estimate APY

    address public govVault; // YFV -> VALUE, vUSD, vETH and 6.7% profit from Value Vaults
    address public insuranceFund = 0xb7b2Ea8A1198368f950834875047aA7294A2bDAa; // set to Governance Multisig at start
    address public performanceReward = 0x7Be4D5A99c903C437EC77A20CB6d0688cBB73c7f; // set to deploy wallet at start

    uint256 public constant FEE_DENOMINATOR = 10000;
    uint256 public govVaultProfitShareFee = 670; // 6.7% | VIP-1 (https://yfv.finance/vip-vote/vip_1)
    uint256 public gasFee = 50; // 0.5% at start and can be set by governance decision

    uint256 public minStakeTimeToClaimVaultReward = 24 hours;

    mapping(address => bool) public isVault;
    mapping(uint256 => address) public vaultByKey;

    mapping(address => bool) public isStrategy;
    mapping(uint256 => address) public strategyByKey;
    mapping(address => uint256) public strategyQuota;

    constructor(address _govToken, address _yfv, address _usdc) public {
        govToken = _govToken;
        yfv = _yfv;
        usdc = _usdc;
        governance = tx.origin;
    }

    function setGovernance(address _governance) external {
        require(msg.sender == governance, "!governance");
        governance = _governance;
    }

    // Immutable once set.
    function setBank(address _bank) external {
        require(msg.sender == governance, "!governance");
        require(bank == address(0));
        bank = _bank;
    }

    // Mutable in case we want to upgrade the pool.
    function setMinorPool(address _minorPool) external {
        require(msg.sender == governance, "!governance");
        minorPool = _minorPool;
    }

    // Mutable in case we want to upgrade this module.
    function setProfitSharer(address _profitSharer) external {
        require(msg.sender == governance, "!governance");
        profitSharer = _profitSharer;
    }

    // Mutable, in case governance want to upgrade VALUE to new version
    function setGovToken(address _govToken) external {
        require(msg.sender == governance, "!governance");
        govToken = _govToken;
    }

    // Immutable once added, and you can always add more.
    function addVault(uint256 _key, address _vault) external {
        require(msg.sender == governance, "!governance");
        require(vaultByKey[_key] == address(0), "vault: key is taken");

        isVault[_vault] = true;
        vaultByKey[_key] = _vault;
    }

    // Mutable and removable.
    function addStrategy(uint256 _key, address _strategy) external {
        require(msg.sender == governance, "!governance");
        isStrategy[_strategy] = true;
        strategyByKey[_key] = _strategy;
    }

    // Set 0 to disable quota (no limit)
    function setStrategyQuota(address _strategy, uint256 _quota) external {
        require(msg.sender == governance, "!governance");
        strategyQuota[_strategy] = _quota;
    }

    function removeStrategy(uint256 _key) external {
        require(msg.sender == governance, "!governance");
        isStrategy[strategyByKey[_key]] = false;
        delete strategyByKey[_key];
    }

    function setGovVault(address _govVault) public {
        require(msg.sender == governance, "!governance");
        govVault = _govVault;
    }

    function setInsuranceFund(address _insuranceFund) public {
        require(msg.sender == governance, "!governance");
        insuranceFund = _insuranceFund;
    }

    function setPerformanceReward(address _performanceReward) public{
        require(msg.sender == governance, "!governance");
        performanceReward = _performanceReward;
    }

    function setGovVaultProfitShareFee(uint256 _govVaultProfitShareFee) public {
        require(msg.sender == governance, "!governance");
        govVaultProfitShareFee = _govVaultProfitShareFee;
    }

    function setGasFee(uint256 _gasFee) public {
        require(msg.sender == governance, "!governance");
        gasFee = _gasFee;
    }

    function setMinStakeTimeToClaimVaultReward(uint256 _minStakeTimeToClaimVaultReward) public {
        require(msg.sender == governance, "!governance");
        minStakeTimeToClaimVaultReward = _minStakeTimeToClaimVaultReward;
    }

    /**
     * This function allows governance to take unsupported tokens out of the contract.
     * This is in an effort to make someone whole, should they seriously mess up.
     * There is no guarantee governance will vote to return these.
     * It also allows for removal of airdropped tokens.
     */
    function governanceRecoverUnsupported(IERC20x _token, uint256 amount, address to) external {
        require(msg.sender == governance, "!governance");
        _token.transfer(to, amount);
    }
}

interface IERC20x {
    function transfer(address recipient, uint256 amount) external returns (bool);
}

// File: contracts/vaults/ValueMinorPool.sol

interface IYFVReferral {
    function setReferrer(address farmer, address referrer) external;
    function getReferrer(address farmer) external view returns (address);
}

interface IFreeFromUpTo {
    function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);
}

// Similar to ValueMasterPool but will generate only a small amount of VALUE for 2 weeks at most. And we remove Migration process from this pool. Happy farming dude!
contract ValueMinorPool is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IFreeFromUpTo public constant chi = IFreeFromUpTo(0x0000000000004946c0e9F43F4Dee607b0eF1fA1c);

    modifier discountCHI {
        uint256 gasStart = gasleft();
        _;
        uint256 gasSpent = 21000 + gasStart - gasleft() + 16 * msg.data.length;
        chi.freeFromUpTo(msg.sender, (gasSpent + 14154) / 41130);
    }

    // Info of each user.
    struct UserInfo {
        uint256 amount;     // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        uint256 accumulatedStakingPower; // will accumulate every time user harvest
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken;           // Address of LP token contract.
        uint256 allocPoint;       // How many allocation points assigned to this pool. VALUEs to distribute per block.
        uint256 lastRewardBlock;  // Last block number that VALUEs distribution occurs.
        uint256 accValuePerShare; // Accumulated VALUEs per share, times 1e12. See below.
        bool isStarted; // if lastRewardBlock has passed
    }

    uint256 public constant REFERRAL_COMMISSION_PERCENT = 1;
    address public rewardReferral;

    // The VALUE TOKEN!
    ValueLiquidityToken public value;
    // InsuranceFund address.
    address public insuranceFundAddr;
    // VALUE tokens created per block.
    uint256 public valuePerBlock;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    // Total allocation poitns. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when VALUE mining starts.
    uint256 public startBlock;

    ValueVaultMaster public vaultMaster;

    // Block number when each epoch ends.
    uint256[3] public epochEndBlocks = [11000000, 1000000000, 2000000000];

    // Reward multipler
    uint256[4] public epochRewardMultiplers = [500, 0, 0, 0];

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    constructor(
        ValueLiquidityToken _value,
        address _insuranceFundAddr,
        uint256 _valuePerBlock,
        uint256 _startBlock,
        ValueVaultMaster _vaultMaster
    ) public {
        value = _value;
        insuranceFundAddr = _insuranceFundAddr;
        valuePerBlock = _valuePerBlock; // supposed to be 0.001 (1e16 wei)
        startBlock = _startBlock; // supposed to be 10,916,000 (Wed Sep 23 2020 02:00:00 GMT+0)
        vaultMaster = _vaultMaster;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate, uint256 _lastRewardBlock) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        if (block.number < startBlock) {
            // chef is sleeping
            if (_lastRewardBlock == 0) {
                _lastRewardBlock = startBlock;
            } else {
                if (_lastRewardBlock < startBlock) {
                    _lastRewardBlock = startBlock;
                }
            }
        } else {
            // chef is cooking
            if (_lastRewardBlock == 0 || _lastRewardBlock < block.number) {
                _lastRewardBlock = block.number;
            }
        }
        bool _isStarted = (block.number >= _lastRewardBlock) && (_lastRewardBlock >= startBlock);
        poolInfo.push(PoolInfo({
            lpToken: _lpToken,
            allocPoint: _allocPoint,
            lastRewardBlock: _lastRewardBlock,
            accValuePerShare: 0,
            isStarted: _isStarted
            }));
        if (_isStarted) {
            totalAllocPoint = totalAllocPoint.add(_allocPoint);
        }
    }

    // Update the given pool's VALUE allocation point. Can only be called by the owner.
    function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        PoolInfo storage pool = poolInfo[_pid];
        if (pool.isStarted) {
            totalAllocPoint = totalAllocPoint.sub(pool.allocPoint).add(_allocPoint);
        }
        pool.allocPoint = _allocPoint;
    }

    function setValuePerBlock(uint256 _valuePerBlock) public onlyOwner {
        massUpdatePools();
        valuePerBlock = _valuePerBlock;
    }

    function setEpochEndBlock(uint8 _index, uint256 _epochEndBlock) public onlyOwner {
        require(_index < 3, "_index out of range");
        require(_epochEndBlock > block.number, "Too late to update");
        require(epochEndBlocks[_index] > block.number, "Too late to update");
        epochEndBlocks[_index] = _epochEndBlock;
    }

    function setEpochRewardMultipler(uint8 _index, uint256 _epochRewardMultipler) public onlyOwner {
        require(_index > 0 && _index < 4, "Index out of range");
        require(epochEndBlocks[_index - 1] > block.number, "Too late to update");
        epochRewardMultiplers[_index] = _epochRewardMultipler;
    }

    function setRewardReferral(address _rewardReferral) external onlyOwner {
        rewardReferral = _rewardReferral;
    }

    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
        for (uint8 epochId = 3; epochId >= 1; --epochId) {
            if (_to >= epochEndBlocks[epochId - 1]) {
                if (_from >= epochEndBlocks[epochId - 1]) return _to.sub(_from).mul(epochRewardMultiplers[epochId]);
                uint256 multiplier = _to.sub(epochEndBlocks[epochId - 1]).mul(epochRewardMultiplers[epochId]);
                if (epochId == 1) return multiplier.add(epochEndBlocks[0].sub(_from).mul(epochRewardMultiplers[0]));
                for (epochId = epochId - 1; epochId >= 1; --epochId) {
                    if (_from >= epochEndBlocks[epochId - 1]) return multiplier.add(epochEndBlocks[epochId].sub(_from).mul(epochRewardMultiplers[epochId]));
                    multiplier = multiplier.add(epochEndBlocks[epochId].sub(epochEndBlocks[epochId - 1]).mul(epochRewardMultiplers[epochId]));
                }
                return multiplier.add(epochEndBlocks[0].sub(_from).mul(epochRewardMultiplers[0]));
            }
        }
        return _to.sub(_from).mul(epochRewardMultiplers[0]);
    }

    // View function to see pending VALUEs on frontend.
    function pendingValue(uint256 _pid, address _user) public view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accValuePerShare = pool.accValuePerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            if (totalAllocPoint > 0) {
                uint256 valueReward = multiplier.mul(valuePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
                accValuePerShare = accValuePerShare.add(valueReward.mul(1e12).div(lpSupply));
            }
        }
        return user.amount.mul(accValuePerShare).div(1e12).sub(user.rewardDebt);
    }

    function stakingPower(uint256 _pid, address _user) public view returns (uint256) {
        UserInfo storage user = userInfo[_pid][_user];
        return user.accumulatedStakingPower.add(pendingValue(_pid, _user));
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public discountCHI {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public discountCHI {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        if (!pool.isStarted) {
            pool.isStarted = true;
            totalAllocPoint = totalAllocPoint.add(pool.allocPoint);
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        if (totalAllocPoint > 0) {
            uint256 valueReward = multiplier.mul(valuePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
            safeValueMint(address(this), valueReward);
            pool.accValuePerShare = pool.accValuePerShare.add(valueReward.mul(1e12).div(lpSupply));
        }
        pool.lastRewardBlock = block.number;
    }

    // Deposit LP tokens to the pool for VALUE allocation.
    function deposit(uint256 _pid, uint256 _amount, address _referrer) public discountCHI {
        depositOnBehalf(msg.sender, _pid, _amount, _referrer);
    }

    function depositOnBehalf(address farmer, uint256 _pid, uint256 _amount, address _referrer) public {
        require(msg.sender == farmer || msg.sender == vaultMaster.bank(), "!bank && !yourself");
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][farmer];
        updatePool(_pid);
        if (rewardReferral != address(0) && _referrer != address(0)) {
            require(_referrer != farmer, "You cannot refer yourself.");
            IYFVReferral(rewardReferral).setReferrer(farmer, _referrer);
        }
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accValuePerShare).div(1e12).sub(user.rewardDebt);
            if(pending > 0) {
                user.accumulatedStakingPower = user.accumulatedStakingPower.add(pending);
                uint256 actualPaid = pending.mul(100 - REFERRAL_COMMISSION_PERCENT).div(100); // 99%
                uint256 commission = pending - actualPaid; // 1%
                safeValueTransfer(farmer, actualPaid);
                if (rewardReferral != address(0)) {
                    _referrer = IYFVReferral(rewardReferral).getReferrer(farmer);
                }
                if (_referrer != address(0)) { // send commission to referrer
                    safeValueTransfer(_referrer, commission);
                } else { // send commission to insuranceFundAddr
                    safeValueTransfer(insuranceFundAddr, commission);
                }
            }
        }
        if(_amount > 0) {
            pool.lpToken.safeTransferFrom(farmer, address(this), _amount);
            user.amount = user.amount.add(_amount);
        }
        user.rewardDebt = user.amount.mul(pool.accValuePerShare).div(1e12);
        emit Deposit(farmer, _pid, _amount);
    }

    // Withdraw LP tokens from the pool.
    function withdraw(uint256 _pid, uint256 _amount) public discountCHI {
        withdrawOnBehalf(msg.sender, _pid, _amount);
    }

    function withdrawOnBehalf(address farmer, uint256 _pid, uint256 _amount) public {
        require(msg.sender == farmer || msg.sender == vaultMaster.bank(), "!bank && !yourself");
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][farmer];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.accValuePerShare).div(1e12).sub(user.rewardDebt);
        if(pending > 0) {
            user.accumulatedStakingPower = user.accumulatedStakingPower.add(pending);
            uint256 actualPaid = pending.mul(100 - REFERRAL_COMMISSION_PERCENT).div(100); // 99%
            uint256 commission = pending - actualPaid; // 1%
            safeValueTransfer(farmer, actualPaid);
            address _referrer = address(0);
            if (rewardReferral != address(0)) {
                _referrer = IYFVReferral(rewardReferral).getReferrer(farmer);
            }
            if (_referrer != address(0)) { // send commission to referrer
                safeValueTransfer(_referrer, commission);
            } else { // send commission to insuranceFundAddr
                safeValueTransfer(insuranceFundAddr, commission);
            }
        }
        if(_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(farmer, _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accValuePerShare).div(1e12);
        emit Withdraw(farmer, _pid, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
    }

    // Safe value mint, ensure it is never over cap and we are the current owner.
    function safeValueMint(address _to, uint256 _amount) internal {
        if (value.minters(address(this)) && _to != address(0)) {
            uint256 totalSupply = value.totalSupply();
            uint256 realCap = value.cap().add(value.yfvLockedBalance());
            if (totalSupply.add(_amount) > realCap) {
                value.mint(_to, realCap.sub(totalSupply));
            } else {
                value.mint(_to, _amount);
            }
        }
    }

    // Safe value transfer function, just in case if rounding error causes pool to not have enough VALUEs.
    function safeValueTransfer(address _to, uint256 _amount) internal {
        uint256 valueBal = value.balanceOf(address(this));
        if (_amount > valueBal) {
            value.transfer(_to, valueBal);
        } else {
            value.transfer(_to, _amount);
        }
    }

    // Update insuranceFund by the previous insuranceFund contract.
    function setInsuranceFundAddr(address _insuranceFundAddr) public {
        require(msg.sender == insuranceFundAddr, "insuranceFund: wut?");
        insuranceFundAddr = _insuranceFundAddr;
    }

    // This function allows governance to take unsupported tokens out of the contract, since this pool exists longer than the other pools.
    // This is in an effort to make someone whole, should they seriously mess up.
    // There is no guarantee governance will vote to return these.
    // It also allows for removal of airdropped tokens.
    function governanceRecoverUnsupported(IERC20 _token, uint256 amount, address to) external onlyOwner {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            PoolInfo storage pool = poolInfo[pid];
            // cant take staked asset
            require(_token != pool.lpToken, "!pool.lpToken");
        }
        // transfer to
        _token.safeTransfer(to, amount);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ValueLiquidityToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"valuePerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vaultMaster","outputs":[{"internalType":"contract ValueVaultMaster","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"farmer","type":"address"},{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawOnBehalf","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000049e833337ece7afe375e44f4e3e8481029218e5c000000000000000000000000b7b2ea8a1198368f950834875047aa7294a2bdaa00000000000000000000000000000000000000000000000000038d7ea4c680000000000000000000000000000000000000000000000000000000000000a690a0000000000000000000000000aa8ecca0082c34ab8c30b4d896eb8eecc5004b28

-----Decoded View---------------
Arg [0] : _value (address): 0x49E833337ECe7aFE375e44F4E3e8481029218E5c
Arg [1] : _insuranceFundAddr (address): 0xb7b2Ea8A1198368f950834875047aA7294A2bDAa
Arg [2] : _valuePerBlock (uint256): 1000000000000000
Arg [3] : _startBlock (uint256): 10916000
Arg [4] : _vaultMaster (address): 0xAa8ECCa0082c34Ab8c30B4D896eB8eEcC5004b28

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 00000000000000000000000049e833337ece7afe375e44f4e3e8481029218e5c
Arg [1] : 000000000000000000000000b7b2ea8a1198368f950834875047aa7294a2bdaa
Arg [2] : 00000000000000000000000000000000000000000000000000038d7ea4c68000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000a690a0
Arg [4] : 000000000000000000000000aa8ecca0082c34ab8c30b4d896eb8eecc5004b28

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