// File: Context.sol



pragma solidity ^0.4.24;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// File: ERC20Detailed.sol



pragma solidity ^0.4.24;

import "./IERC20.sol";

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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;
    }
}
// File: ERC20_mod.sol



pragma solidity ^0.4.24;

import "./Context.sol";
import "./IERC20.sol";
import "./SafeMath.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 {ERC20Mintable}.
 *
 * 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_mod is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    
    // added by Kim
    
    function transferFrom2(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        
        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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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 {
        require(account != address(0), "ERC20: burn from the zero address");

        _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 is 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 {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}
// File: IERC20.sol



pragma solidity ^0.4.24;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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: PROTtoken.sol



pragma solidity ^0.4.24;

import "./Context.sol";
import "./ERC20_mod.sol";
import "./ERC20Detailed.sol";

/**
 * @title SimpleToken
 * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
 * Note they can later distribute these tokens as they wish using `transfer` and other
 * `ERC20` functions.
 */
contract PROTtoken is Context, ERC20_mod, ERC20Detailed {
    
    uint256 public totalSupplyofToken;
    address private owner;
    
    modifier onlyOwner () {
        require(_msgSender() == owner);
        _;
    }
    
    /**
     * @dev Constructor that gives _msgSender() all of existing tokens.
     */
    constructor () public ERC20Detailed("PROTtoken", "prot", 18) {
        
        owner = _msgSender();
        totalSupplyofToken = 1212000000 * (10 ** uint256(decimals()));
        _mint(_msgSender(), totalSupplyofToken);
    }
    
    function mint_GLEX(uint256 _amount) public onlyOwner {
        uint256 mint_amount = _amount * (10 ** uint256(decimals()));
        _mint(_msgSender(), mint_amount);
    } 
    
    function burn_GLEX(uint256 _amount) public onlyOwner {
        uint256 burn_amount = _amount * (10 ** uint256(decimals()));
        _burn(_msgSender(), burn_amount);
    }
}
// File: PROT_MN_reward.sol



pragma solidity ^0.4.24;

import "./PROTtoken.sol";

contract PROT_MN_reward {
    
    struct UserInfo {
        uint16 mnCnt;
        uint32 tokenCnt;
        uint256 applyTime;
        uint32 totalReward;
        uint32 unPayedReward;
        uint32 payedReward;
    }
    
    uint256 public deployTime;
    uint32 private totalUserReward;
    uint16 public totalMNcount = 0;
    uint256 private constant aMonth = 1 * 30 days;
    uint24 public  constant tokenPerMN = 50000;
    uint8 private constant applyMNcount = 1;
    uint8 private constant withdrawMNcount = 1;
    uint16 private constant dailyRewardCount = 1440;
    uint16[11] private rewardLevel = [
         36, // 1 month
         48, // 2 month
         40, // 3 month
         60, // 4 month
         80, // 5 month
         84, // 6 month
         92, // 8 month
         96, // 10 month
        100, // 12 month
         72, // 24 month
         36  // after 24 month
    ];
    
    mapping (address => UserInfo) public user; 
    address[] internal users;
    address private owner;
    
    PROTtoken public protToken;
    
    modifier onlyOwner () {
        require(msg.sender == owner);
        _;
    }
    
    constructor() public {
        deployTime = now + (1 * 7 days);
        owner = msg.sender;
    }
    
    function () external payable{
        if(msg.value <= 0){
            revert();
        }
    }
    
    function getOwner() public onlyOwner view returns(address){
        return owner;
    }
    
    function setPROTtoken (address _addr) public onlyOwner {
        protToken = PROTtoken(_addr);    
    }
    
    //ok - user function
    function applyMasternode() public returns (bool) {
        
        require(protToken.balanceOf(msg.sender) >= applyMNcount * tokenPerMN);
        
        bool result = saveUserInfo(msg.sender);
        
        protToken.transferFrom2(msg.sender, address(this), applyMNcount * tokenPerMN * 10 ** uint256(protToken.decimals()));
        
        return result;
    }
    
    
    //ok
    function saveUserInfo(address _user) private returns(bool) {
        
        if(applyMNcount != 1) { revert();}
        
        //existing account flag
        uint8 chkUser;
        
        for(uint16 i=0; i<users.length; i++){
            if(users[i] == _user){
                chkUser += 1;
            }
        }
        
        if(chkUser == 0){  //first masternode apply
            users.push(_user); 
            user[_user].applyTime = now;
        }else if(chkUser != 0 && user[_user].applyTime == 0){  //masternode re-apply
            user[_user].applyTime = now;
        }
        
        user[_user].mnCnt    += applyMNcount;
        user[_user].tokenCnt += applyMNcount * tokenPerMN;
        
        totalMNcount += applyMNcount;
        
        return true;
    }    
    
    //ok - automatical apply
    function applyMasternode2(address _user,uint16 _mnCnt) public onlyOwner returns (bool) {
        
        require(protToken.balanceOf(owner) >= _mnCnt * tokenPerMN);
        
        bool result = saveUserInfo2(_user, _mnCnt);
        
        protToken.transferFrom2(owner, address(this), _mnCnt * tokenPerMN * 10 ** uint256(protToken.decimals()));
        
        return result;
    }
    
    //ok - automatical apply
    function saveUserInfo2(address _user, uint16 _mnCnt) private returns(bool) {
        
        if(_mnCnt <= 0) { revert();}
        
        uint8 chkUser;
        
        for(uint16 i=0; i<users.length; i++){
            if(users[i] == _user){
                chkUser += 1;
            }
        }
        
        if(chkUser == 0){ 
            users.push(_user); 
            
            user[_user].mnCnt     = _mnCnt;
            user[_user].tokenCnt  = _mnCnt * tokenPerMN;
            user[_user].applyTime = now;    
        }else{
            user[_user].mnCnt    += _mnCnt;
            user[_user].tokenCnt += _mnCnt * tokenPerMN;
        }
        
        totalMNcount += _mnCnt;
        
        return true;
    }
    
    //ok
    function dailyReward(uint16 _startNum, uint16 _endNum, uint8 _period) public onlyOwner returns(uint32, uint16) {
        uint32 todayReward;
        uint16 rewardUsers;
        
        (todayReward, rewardUsers) = masterNodeReward(_startNum, _endNum, _period);
        
        
        // protToken.transferFrom2(owner, address(this), todayReward * 10 ** uint256(protToken.decimals()));
        
        return (todayReward, rewardUsers);
    }
    
    //ok
    function masterNodeReward(uint16 _startNum, uint16 _endNum, uint8 _period) private returns(uint32, uint16){
        
        uint32 thisTimeTotalReward;
        uint16 userCnt;
        uint32 _todayNodeReward_ = todayPerNodeReward() * _period;

        if(users.length == 0){
            revert();
        }else{
            for(uint16 i=_startNum; i<=_endNum; i++){
                if(user[users[i]].mnCnt > 0){
                    user[users[i]].totalReward   += user[users[i]].mnCnt * _todayNodeReward_;
                    user[users[i]].unPayedReward += user[users[i]].mnCnt * _todayNodeReward_;
                    
                    thisTimeTotalReward += user[users[i]].mnCnt * _todayNodeReward_;
                    userCnt++;
                    totalUserReward += thisTimeTotalReward;
                }
            }
        }
        
        return (thisTimeTotalReward, userCnt); 
    }
    
    //ok
    function withdraw(uint32 _amount) public returns(uint256){
        
        uint32 amount = _amount;
        
        if(amount > user[msg.sender].unPayedReward) {revert();}
        
        applyWithdraw(msg.sender, amount);
        
        protToken.transferFrom2(address(this), msg.sender, amount * 10 ** uint256(protToken.decimals()));
        
        return protToken.balanceOf(msg.sender);
    }
    
    //ok user function
    function withdrawMasterNode() public returns(uint256){
        
        uint32 withdrawAmount = withdrawMNcount * tokenPerMN;
        
        if(withdrawMNcount > user[msg.sender].mnCnt) {revert();}
        
        user[msg.sender].mnCnt -= withdrawMNcount;
                                    
        user[msg.sender].tokenCnt -= withdrawAmount;
        
        //totally close
        if(user[msg.sender].mnCnt == 0 && user[msg.sender].tokenCnt == 0){
            withdrawAmount += user[msg.sender].unPayedReward;
            user[msg.sender].applyTime     = 0;
            user[msg.sender].totalReward   = 0;
            user[msg.sender].unPayedReward = 0;
            user[msg.sender].payedReward   = 0;
        }
        
        protToken.transferFrom2(address(this), msg.sender, withdrawAmount  * 10 ** uint256(protToken.decimals()));
        
        return protToken.balanceOf(msg.sender);   
    }
    
    //ok
    function applyWithdraw(address _addr, uint32 _amount) private {
        
        user[_addr].unPayedReward -= _amount;
        user[_addr].payedReward   += _amount;
        
    }
    
    //ok - user function
    function closeMNandWithdrawl() public returns(uint256){
        
        uint256 closeMNandToken = (user[msg.sender].mnCnt * tokenPerMN) + user[msg.sender].unPayedReward;
        
        totalMNcount -= user[msg.sender].mnCnt;
        
        user[msg.sender].mnCnt         = 0;
        user[msg.sender].tokenCnt      = 0;
        user[msg.sender].applyTime     = 0;
        user[msg.sender].totalReward   = 0;
        user[msg.sender].unPayedReward = 0;
        user[msg.sender].payedReward   = 0;
        
        protToken.transferFrom2(address(this), msg.sender, closeMNandToken * 10 ** uint256(protToken.decimals()));
        
        return protToken.balanceOf(msg.sender);
    }

    // added
    function modUserMNstatus(address _user, uint16 _mnCnt, uint32 _totalReward) public onlyOwner returns (bool){
        
        uint16 userIdx = searchUserIndex(_user);
        
        if(userIdx == 65535){ 
            
            revert(); 
            
        }else{
            
            user[_user].mnCnt         = _mnCnt;
            user[_user].tokenCnt      = _mnCnt * tokenPerMN;
            user[_user].totalReward   = _totalReward;
            user[_user].unPayedReward = _totalReward - user[_user].payedReward;
            
            return true;
        }
    }
    
    function getUserInfo(address _user) public view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
      
        return (
            user[_user].mnCnt, 
            user[_user].tokenCnt, 
            user[_user].applyTime, 
            user[_user].totalReward, 
            user[_user].unPayedReward, 
            user[_user].payedReward
        );
    }
    
    //ok - user function
    function getMyInfo() public view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
      
        return (
            user[msg.sender].mnCnt, 
            user[msg.sender].tokenCnt, 
            user[msg.sender].applyTime, 
            user[msg.sender].totalReward, 
            user[msg.sender].unPayedReward, 
            user[msg.sender].payedReward
        );
    }
    
    function getTotalMNcount() public view returns(uint256){
        return totalMNcount;
    }
    
    function getBalanceInfo() public view returns(uint256, uint256){
        
        uint256 tokenBalance = protToken.balanceOf(address(this));
        uint256 ethBalance   = address(this).balance;
        
        return (tokenBalance,ethBalance);
    }
    
    function getTotalUsersReward() public view returns(uint256){
        return totalUserReward;
    }
    
    function getEachUserReward(address _addr) public view returns(uint256, uint256){ 
        return (user[_addr].totalReward, user[_addr].unPayedReward);
    }
    
    //ok - user function
    function getCurrentReward() public view returns(uint16){
        if(now <= deployTime + aMonth){return rewardLevel[0];}    //36
        else if(now > deployTime + aMonth && now <= deployTime + (aMonth * 2)){return rewardLevel[1];}       //48
        else if(now > deployTime + (aMonth * 2) && now <= deployTime + (aMonth * 3)){return rewardLevel[2];} //40
        else if(now > deployTime + (aMonth * 3) && now <= deployTime + (aMonth * 4)){return rewardLevel[3];} //60 
        else if(now > deployTime + (aMonth * 4) && now <= deployTime + (aMonth * 5)){return rewardLevel[4];} //80
        else if(now > deployTime + (aMonth * 5) && now <= deployTime + (aMonth * 6)){return rewardLevel[5];} //84
        else if(now > deployTime + (aMonth * 6) && now <= deployTime + (aMonth * 8)){return rewardLevel[6];} //92
        else if(now > deployTime + (aMonth * 8) && now <= deployTime + (aMonth * 10)){return rewardLevel[7];} //96
        else if(now > deployTime + (aMonth * 10) && now <= deployTime + (aMonth * 12)){return rewardLevel[8];} //100
        else if(now > deployTime + (aMonth * 12) && now <= deployTime + (aMonth * 24)){return rewardLevel[9];} //72 
        else if(now > deployTime + (aMonth * 24) && now <= deployTime + (aMonth * 84)){return rewardLevel[10];} //36
        else{ return 0;}
    }
    
    //ok - user function
    function getTotalSupply() public view returns(uint256){
        return protToken.totalSupply();
    } 
    
    function getBalanceOf(address _user) public view returns(uint256){
        return protToken.balanceOf(_user);
    }
    
    //ok
    function todayPerNodeReward() private view returns(uint32){
    
        uint32 todayReward = ((dailyRewardCount * getCurrentReward()) / totalMNcount);
        
        return todayReward;
    }
    
    //ok - user function
    function getMyBalance() public view returns(uint256){
        return protToken.balanceOf(msg.sender);
    }
    
    //important
    function withdrawEth() public onlyOwner returns(bool){
        address(msg.sender).transfer(address(this).balance);
    }
    
    //important
    function withdrawPROTbalance(uint32 _amount) public onlyOwner returns(bool){
        
        protToken.transferFrom2(address(this), owner , _amount * 10 ** uint256(protToken.decimals()));
        
        return true;
    }
    
    //ok - user function
    function protTransfer(address _recipient, uint32 _amount) public returns(bool) {
        
        protToken.transferFrom2(msg.sender, _recipient , _amount * 10 ** uint256(protToken.decimals()));
        
        return true;
    }
    
    function getUsersLength() public view returns(uint256){
        return users.length;    
    }
    
    function getUserInfoByIndex(uint256 _index) public view returns(address, uint256){
        
        address userAccount = users[_index]; 
        
        return (userAccount, user[userAccount].mnCnt);
        
    }

    //added
    function searchUserIndex(address _user) public view returns(uint16) {
        
        for(uint16 i=0; i<users.length; i++){
            if(users[i] == _user){
                return i;
            }
        }
        
        return 65535;
    }
}
// File: SafeMath.sol



pragma solidity ^0.4.24;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}