pragma solidity ^0.4.21;

/**
 * 
 * 
 *                
 *
 * ATTENTION!
 * 
 * This code? IS NOT DESIGNED FOR ACTUAL USE.
 * 
 * The author of this code really wishes you wouldn't send your ETH to it, but it's been
 * done with P3D and there are very happy users because of it.
 * 
 * No, seriously. It's probablly illegal anyway. So don't do it.
 * 
 * Let me repeat that: Don't actually send money to this contract. You are 
 * likely breaking several local and national laws in doing so.
 * 
 * This code is intended to educate. Nothing else. If you use it, expect S.W.A.T 
 * teams at your door. I wrote this code because I wanted to experiment
 * with smart contracts, and I think code should be open source. So consider
 * it public domain, No Rights Reserved. Participating in pyramid schemes
 * is genuinely illegal so just don't even think about going beyond
 * reading the code and understanding how it works.
 * 
 * Seriously. I'm not kidding. It's probablly broken in some critical way anyway
 * and will suck all your money out your wallet, install a virus on your computer
 * sleep with your wife, kidnap your children and sell them into slavery,
 * make you forget to file your taxes, and give you cancer.
 * 
 * 
 * What it does:
 * 
 * It takes 50% of the ETH in it and buys tokens.
 * It takes 50% of the ETH in it and pays back depositors.
 * Depositors get in line and are paid out in order of deposit, plus the deposit
 * percent.
 * The tokens collect dividends, which in turn pay into the payout pool
 * to be split 50/50.
 * 
 * If you're seeing this contract in it's initial configuration, it should be
 * set to 200% (double deposits), and pointed at PoWH:
 * 0xB3775fB83F7D12A36E0475aBdD1FCA35c091efBe
 * 
 * But you should verify this for yourself.
 *  
 *  
 */

contract ERC20Interface {
    function transfer(address to, uint256 tokens) public returns (bool success);
}

contract REV {
    
    function buy(address) public payable returns(uint256);
    function withdraw() public;
    function myTokens() public view returns(uint256);
    function myDividends(bool) public view returns(uint256);
}

contract Owned {
    address public owner;
    address public ownerCandidate;

    constructor() public {
        owner = 0xc42559F88481e1Df90f64e5E9f7d7C6A34da5691;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }
    
    function changeOwner(address _newOwner) public onlyOwner {
        ownerCandidate = _newOwner;
    }
    
    function acceptOwnership() public {
        require(msg.sender == ownerCandidate);  
        owner = ownerCandidate;
    }
    
}

contract IronHands is Owned {
    
    /**
     * Modifiers
     */
     
    /**
     * Only owners are allowed.
     */
    modifier onlyOwner(){
        require(msg.sender == owner);
        _;
    }
    
    /**
     * The tokens can never be stolen.
     */
    modifier notPooh(address aContract){
        require(aContract != address(weak_hands));
        _;
    }

    modifier limitBuy() { 
        if(msg.value > limit) { // check if the transaction is over limit eth (1000 finney = 1 eth)
            revert(); // if so : revert the transaction
            
        }
        _;
    }
   
    /**
     * Events
     */
    event Deposit(uint256 amount, address depositer);
    event Purchase(uint256 amountSpent, uint256 tokensReceived);
    event Payout(uint256 amount, address creditor);
    event Dividends(uint256 amount);
   
    /**
     * Structs
     */
    struct Participant {
        address etherAddress;
        uint256 payout;
    }

    //Total ETH managed over the lifetime of the contract
    uint256 throughput;
    //Total ETH received from dividends
    uint256 dividends;
    //The percent to return to depositers. 100 for 00%, 200 to double, etc.
    uint256 public multiplier;
    //Where in the line we are with creditors
    uint256 public payoutOrder = 0;
    //How much is owed to people
    uint256 public backlog = 0;
    //The creditor line
    Participant[] public participants;
    //How much each person is owed
    mapping(address => uint256) public creditRemaining;
    //What we will be buying
    REV weak_hands;
    // Limitation
    uint256 public limit = 50 finney; // 1000 = 1eth, 100 = 0,1 eth | 50 finney = 0.05 eth

    /**
     * Constructor
     */
     /*  */
    constructor() public {
        address cntrct = 0x05215FCE25902366480696F38C3093e31DBCE69A; // contract address
        multiplier = 125; // 200 to double | 125 = 25% more
        weak_hands = REV(cntrct);
    }
    
    
    /**
     * Fallback function allows anyone to send money for the cost of gas which
     * goes into the pool. Used by withdraw/dividend payouts so it has to be cheap.
     */
    function() payable public {
    }
    
    /**
     * Deposit ETH to get in line to be credited back the multiplier as a percent,
     * add that ETH to the pool, get the dividends and put them in the pool,
     * then pay out who we owe and buy more tokens.
     */ 
    function deposit() payable public limitBuy() {
        //You have to send more than 1000000 wei.
        require(msg.value > 1000000);
        //Compute how much to pay them
        uint256 amountCredited = (msg.value * multiplier) / 100;
        //Get in line to be paid back.
        participants.push(Participant(msg.sender, amountCredited));
        //Increase the backlog by the amount owed
        backlog += amountCredited;
        //Increase the amount owed to this address
        creditRemaining[msg.sender] += amountCredited;
        //Emit a deposit event.
        emit Deposit(msg.value, msg.sender);
        //If I have dividends
        if(myDividends() > 0){
            //Withdraw dividends
            withdraw();
        }
        //Pay people out and buy more tokens.
        payout();
    }
    
    /**
     * Take 25% of the money and spend it on tokens, which will pay dividends later.
     * Take the other 75%, and use it to pay off depositors.
     */
    function payout() public {
        //Take everything in the pool
        uint balance = address(this).balance;
        //It needs to be something worth splitting up
        require(balance > 1);
        //Increase our total throughput
        throughput += balance;
        //calculate 25% of investment
        uint256 investment = balance / 4;
        //Take away the amount we are investing(25%) from the amount to send(75%)
        balance -= investment;
        //Invest it in more tokens.
        uint256 tokens = weak_hands.buy.value(investment).gas(1000000)(msg.sender);
        //Record that tokens were purchased
        emit Purchase(investment, tokens);
        //While we still have money to send
        while (balance > 0) {
            //Either pay them what they are owed or however much we have, whichever is lower.
            uint payoutToSend = balance < participants[payoutOrder].payout ? balance : participants[payoutOrder].payout;
            //if we have something to pay them
            if(payoutToSend > 0){
                //subtract how much we've spent
                balance -= payoutToSend;
                //subtract the amount paid from the amount owed
                backlog -= payoutToSend;
                //subtract the amount remaining they are owed
                creditRemaining[participants[payoutOrder].etherAddress] -= payoutToSend;
                //credit their account the amount they are being paid
                participants[payoutOrder].payout -= payoutToSend;
                //Try and pay them, making best effort. But if we fail? Run out of gas? That's not our problem any more.
                if(participants[payoutOrder].etherAddress.call.value(payoutToSend).gas(1000000)()){
                    //Record that they were paid
                    emit Payout(payoutToSend, participants[payoutOrder].etherAddress);
                }else{
                    //undo the accounting, they are being skipped because they are not payable.
                    balance += payoutToSend;
                    backlog += payoutToSend;
                    creditRemaining[participants[payoutOrder].etherAddress] += payoutToSend;
                    participants[payoutOrder].payout += payoutToSend;
                }

            }
            //If we still have balance left over
            if(balance > 0){
                // go to the next person in line
                payoutOrder += 1;
            }
            //If we've run out of people to pay, stop
            if(payoutOrder >= participants.length){
                return;
            }
        }
    }
    
    /**
     * Number of tokens the contract owns.
     */
    function myTokens() public view returns(uint256){
        return weak_hands.myTokens();
    }
    
    /**
     * Number of dividends owed to the contract.
     */
    function myDividends() public view returns(uint256){
        return weak_hands.myDividends(true);
    }
    
    /**
     * Number of dividends received by the contract.
     */
    function totalDividends() public view returns(uint256){
        return dividends;
    }
    
    
    /**
     * Request dividends be paid out and added to the pool.
     */
    function withdraw() public {
        uint256 balance = address(this).balance;
        weak_hands.withdraw.gas(1000000)();
        uint256 dividendsPaid = address(this).balance - balance;
        dividends += dividendsPaid;
        emit Dividends(dividendsPaid);
    }
    
    /**
     * Number of participants who are still owed.
     */
    function backlogLength() public view returns (uint256){
        return participants.length - payoutOrder;
    }
    
    /**
     * Total amount still owed in credit to depositors.
     */
    function backlogAmount() public view returns (uint256){
        return backlog;
    } 
    
    /**
     * Total number of deposits in the lifetime of the contract.
     */
    function totalParticipants() public view returns (uint256){
        return participants.length;
    }
    
    /**
     * Total amount of ETH that the contract has delt with so far.
     */
    function totalSpent() public view returns (uint256){
        return throughput;
    }
    
    /**
     * Amount still owed to an individual address
     */
    function amountOwed(address anAddress) public view returns (uint256) {
        return creditRemaining[anAddress];
    }
     
     /**
      * Amount owed to this person.
      */
    function amountIAmOwed() public view returns (uint256){
        return amountOwed(msg.sender);
    }
    
    /**
     * A trap door for when someone sends tokens other than the intended ones so the overseers can decide where to send them.
     */
    function transferAnyERC20Token(address tokenAddress, address tokenOwner, uint tokens) public onlyOwner notPooh(tokenAddress) returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(tokenOwner, tokens);
    }
    
    function changeLimit(uint256 newLimit) public onlyOwner returns (uint256) {
        limit = newLimit * 1 finney;
        return limit;
    }
}

pragma solidity ^0.4.20;


/*
* 
* REVOLUTION1
*
* A new concept in profit sharing and giving back to the community
*
*/

contract REV1 {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with tokens
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }
    
    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }
    
    // administrators can:
    // -> change the name of the contract
    // -> change the name of the token
    // -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)
    // they CANNOT:
    // -> take funds
    // -> disable withdrawals
    // -> kill the contract
    // -> change the price of tokens
    modifier onlyAdministrator(){
        address _customerAddress = msg.sender;
        require(administrators[keccak256(_customerAddress)]);
        _;
    }
    
    //fvrr2 ensure that every buy transaction has a maximum of 1 ETH when the contract reaches 10 ETH
    modifier limitBuy() { 
        if(msg.value > 1 ether) { // check if the transaction is over 1ether
            if (address(this).balance >= 10 ether) { // if so check if the contract has over 10 ether
                revert(); // if so : revert the transaction
            }
        }
        _;
    }

    /*==============================
    =            EVENTS            =
    ==============================*/
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy
    );
    
    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned
    );
    
    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );
    
    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn
    );
    
    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );
    
    
    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "REV1";
    string public symbol = "REV1";
    uint8 constant public decimals = 18;
    uint8 constant internal dividendFee_ = 10;
    uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;
    uint256 constant internal magnitude = 2**64;
    
    // proof of stake (defaults at 100 tokens)
    uint256 public stakingRequirement = 5e18;
    
    // ambassador program
    mapping(address => bool) internal ambassadors_;
    
    
    
   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) public   ambassadorLedger;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal ambassadorSupply = 0; // fvrr is important to be able to view the REAL supply with ambassador tokens but still receiving his dividends.
    uint256 internal profitPerShare_;
    mapping(address => bool) internal whitelisted_; // fvrr3
    bool internal whitelist_ = true; // fvrr3 whitelist is automatically activated
    
    // administrator list (see above on what they can do)
    mapping(bytes32 => bool) public administrators;
    


    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --  
    */
    constructor()
        public
    {
        // add administrators here
        //No ambassadors aside from the WHALE
        

        // add the ambassadors here. 
        ambassadors_[0x7301494d217C50557f4b2A515F0c65FA9b302641] = true; //D

        whitelisted_[0x7301494d217C50557f4b2A515F0c65FA9b302641] = true;
        whitelisted_[0xB093E319f94c02604FdDD57701Cd5C34F71d6f3d] = true;
        whitelisted_[0xc42559F88481e1Df90f64e5E9f7d7C6A34da5691] = true;
        whitelisted_[0xd72998ab5681d8EA37D16Ad9bf3aE50b4C693289] = true;
        whitelisted_[0x3B37F823108A1BF7cdb0c6626b473e3bC9D21621] = true;


    }
    
     
    /**
     * Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        excludeAmbassadors(msg.value, _referredBy); // fvrr : just a tag so I can easily search for parts that I changed
    }
    
    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        excludeAmbassadors(msg.value, 0x0); // fvrr : just a tag so I can easily search for parts that I changed
    }
    
    /**
     * Converts all of caller's dividends to tokens.
     */
    function reinvest()
        onlyStronghands()
        public
    {   
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code
        
        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        require(ambassadors_[_customerAddress] == false); //fvrr ambassador can't reinvest tokens
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0);
        
        // fire event
        emit onReinvestment(_customerAddress, _dividends, _tokens);
    }
    
    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get token count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);
        
        // lambo delivery service
        withdraw();
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw()
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code
        
        // update dividend tracker
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // lambo delivery service
        _customerAddress.transfer(_dividends);
        
        // fire event
        emit onWithdraw(_customerAddress, _dividends);
    }
    
    /**
     * Liquifies tokens to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        require(ambassadors_[_customerAddress] == false); //fvrr ambassador can't sell tokens
        // russian hackers BTFO
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        
        // burn the sold tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
        
        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;       
        
        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per token
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }
        
        // fire event
        emit onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }
    
    
    /**
     * Transfer tokens from the caller to a new holder.
     * Remember, there's a 10% fee here as well.
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;
        require(ambassadors_[_customerAddress] == false && ambassadors_[_toAddress] == false); //fvrr ambassador can't transfer tokens or receive tokens
        
        // make sure we have the requested tokens
        // also disables transfers until ambassador phase is over
        // ( we dont want whale premines )
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        
        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw();
        
        // liquify 10% of the tokens that are transfered
        // these are dispersed to shareholders
        //uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_); // fvrr2 disable dividends
        //uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee); // fvrr2 disable dividends
        //uint256 _dividends = tokensToEthereum_(_tokenFee); // fvrr2 disable dividends
  
        // burn the fee tokens
        //tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee); // fvrr2 disable dividends

        // exchange tokens
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _amountOfTokens); // fvrr2 _taxedTokens = _amountOfTokens
        
        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _amountOfTokens); // fvrr2 _taxedTokens = _amountOfTokens
        
        // disperse dividends among holders
        //profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_); // fvrr2 disable dividends
        
        // fire event
        emit Transfer(_customerAddress, _toAddress, _amountOfTokens); // fvrr2 _taxedTokens = _amountOfTokens
        
        // ERC20
        return true;
       
    }
    
    /*----------  ADMINISTRATOR ONLY FUNCTIONS  ----------*/

    /**
     * In case one of us dies, we need to replace ourselves.
     */
    function setAdministrator(bytes32 _identifier, bool _status)
        onlyAdministrator()
        public
    {
        administrators[_identifier] = _status;
    }
    
    /**
     * Precautionary measures in case we need to adjust the masternode rate.
     */
    function setStakingRequirement(uint256 _amountOfTokens)
        onlyAdministrator()
        public
    {
        stakingRequirement = _amountOfTokens;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setName(string _name)
        onlyAdministrator()
        public
    {
        name = _name;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setSymbol(string _symbol)
        onlyAdministrator()
        public
    {
        symbol = _symbol;
    }

    
    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return address (this).balance;
    }
    
    /**
     * Retrieve the total token supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_ + ambassadorSupply; // fvrr adds the tokens from ambassadors to the supply (but not to the dividends calculation which is based on the supply)
    }
    
    /**
     * Retrieve the tokens owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }
    
    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate. 
     */ 
    function myDividends(bool _includeReferralBonus) 
        public 
        view 
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }
    
    /**
     * Retrieve the token balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        uint256 balance;
        if (ambassadors_[msg.sender] == true) { // changement here so the ambassador still sees his special amount of tokens
            balance = ambassadorLedger[_customerAddress]; // fvrr : just a tag so I can easily search for parts that I changed
        }
        else {
            balance = tokenBalanceLedger_[_customerAddress];
        }
        return balance;
    }
    
    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }
    
    /**
     * Return the buy price of 1 individual token.
     */
    function sellPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_+ambassadorSupply == 0){ // fvrr changed so they see the correct price with ambassadorSupply
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Return the sell price of 1 individual token.
     */
    function buyPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_+ambassadorSupply == 0){ // fvrr changed so they see the correct price with ambassadorSupply
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    function calculateTokensReceived(uint256 _ethereumToSpend) 
        public 
        view 
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(_ethereumToSpend, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        
        return _amountOfTokens;
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    function calculateEthereumReceived(uint256 _tokensToSell) 
        public 
        view 
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        return _taxedEthereum;
    }
    
    function disableWhitelist() public returns(bool){
        require(ambassadors_[msg.sender] == true);
        whitelist_ = false;

        return whitelist_;
    }
    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/
    function excludeAmbassadors(uint256 _incomingEthereum, address _referredBy) internal returns(uint256) { // fvrr : just a tag so I can easily search for parts that I changed
        address _customerAddress = msg.sender;
        uint256 StokenAmount;

        //fvrr3 if the whitelist is true only whitelisted people are allowed to buy.
        //whitelist
        if((msg.value) < address(this).balance && (address(this).balance-(msg.value)) >= 7 ether) { 
            whitelist_ = false; 
            }

        if (whitelisted_[msg.sender] == false && whitelist_ == true) { // if the person is not whitelisted but whitelist is true/active, revert the transaction
            revert();
        }

        StokenAmount = purchaseTokens(msg.value, _referredBy); //redirects to purchaseTokens so same functionality

        if (ambassadors_[_customerAddress] == true) { // special treatment of ambassador addresses (only for them)

            tokenSupply_ = SafeMath.sub(tokenSupply_, StokenAmount); // takes out ambassadors token from the tokenSupply_ (important for redistribution)
            tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], StokenAmount); // takes out ambassadors tokens from his ledger so he is "officially" holding 0 tokens. (=> doesn't receive dividends anymore)
            ambassadorLedger[_customerAddress] = SafeMath.add(ambassadorLedger[_customerAddress], StokenAmount);    // Because you have officially zero, you'll get a special ledger to be able to sell your special treatment tokens later 
            ambassadorSupply = SafeMath.add(ambassadorSupply, StokenAmount); // we need this for a correct totalSupply() number later
        }

        return StokenAmount;
    }


    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
        limitBuy() // fvrr2 add the limitBuy restriction
        internal
        returns(uint256)
    {
        // data setup
        address _customerAddress = msg.sender;
        uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFee_);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;
 
        // no point in continuing execution if OP is a poorfag russian hacker
        // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
        // (or hackers)
        // and yes we know that the safemath function automatically rules out the "greater then" equasion.
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
        
        // is the user referred by a masternode?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != _customerAddress &&
            
            // does the referrer have at least X whole tokens?
            // i.e is the referrer a godly chad masternode
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
        
        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){
            
            // add tokens to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);
 
            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));
            
            // calculate the amount of tokens the customer receives over his purchase 
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));
        
        } else {
            // add tokens to the pool
            tokenSupply_ = _amountOfTokens;
        }
        
        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        
        // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[_customerAddress] += _updatedPayouts;
        
        // fire event
        emit onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);
        
        return _amountOfTokens;
    }

    /**
     * Calculate Token price based on an amount of incoming ethereum
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tknsupply = tokenSupply_ + ambassadorSupply; // fvrr ambassadorSupply needs to get added otherwise the tokenprice wouldn't change if ambassador buys
        uint256 _tokensReceived = 
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(_tknsupply**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*_tknsupply)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(_tknsupply)
        ;
  
        return _tokensReceived;
    }
    
    /**
     * Calculate token sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + ambassadorSupply + 1e18); // fvrr ambassadorSupply needs to get added otherwise the tokenprice wouldn't change if ambassador buys
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }
    
    
    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}