// Contract: XetherToken
// Target function: function mul(percent storage p, uint a) internal view returns (uint)
pragma solidity 0.5.6;

/** 
 * xether.io - is a gambling ecosystem, which makes a difference by caring about its users.
 * It’s our passion for perfection, as well as finding and creating neat solutions,
 * that keeps us driven towards our goals.
*/

/**
 * @title ERC20Detailed token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract ERC20Detailed {
  string private _name;
  string private _symbol;
  uint8 private _decimals;

  constructor (string memory name, string memory symbol, uint8 decimals) public {
      _name = name;
      _symbol = symbol;
      _decimals = decimals;
  }

  /**
   * @return the name of the token.
   */
  function name() public view returns (string memory) {
      return _name;
  }

  /**
   * @return the symbol of the token.
   */
  function symbol() public view returns (string memory) {
      return _symbol;
  }

  /**
   * @return the number of decimals of the token.
   */
  function decimals() public view returns (uint8) {
      return _decimals;
  }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts 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 Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Originally based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract ERC20 {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;
  mapping (address => mapping (address => uint256)) private _allowed;
  uint256 private _totalSupply;

  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);

  /**
   * @dev Total number of tokens in existence
   */
  function totalSupply() public view returns (uint256) {
      return _totalSupply;
  }

  /**
   * @dev Gets the balance of the specified address.
   * @param owner The address to query the balance of.
   * @return A uint256 representing the amount owned by the passed address.
   */
  function balanceOf(address owner) public view returns (uint256) {
      return _balances[owner];
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param owner address The address which owns the funds.
   * @param spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address owner, address spender) public view returns (uint256) {
      return _allowed[owner][spender];
  }

  /**
   * @dev Transfer token to a specified address
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   */
  function transfer(address to, uint256 value) public returns (bool) {
      _transfer(msg.sender, to, value);
      return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * 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
   * @param spender The address which will spend the funds.
   * @param value The amount of tokens to be spent.
   */
  function approve(address spender, uint256 value) public returns (bool) {
      _approve(msg.sender, spender, value);
      return true;
  }

  /**
   * @dev Transfer tokens from one address to another.
   * Note that while this function emits an Approval event, this is not required as per the specification,
   * and other compliant implementations may not emit the event.
   * @param from address The address which you want to send tokens from
   * @param to address The address which you want to transfer to
   * @param value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address from, address to, uint256 value) public returns (bool) {
      _transfer(from, to, value);
      _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
      return true;
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when _allowed[msg.sender][spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * Emits an Approval event.
   * @param spender The address which will spend the funds.
   * @param addedValue The amount of tokens to increase the allowance by.
   */
  function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
      _approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));
      return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when _allowed[msg.sender][spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * Emits an Approval event.
   * @param spender The address which will spend the funds.
   * @param subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
      _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
      return true;
  }

  /**
   * @dev Transfer token for a specified addresses
   * @param from The address to transfer from.
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   */
  function _transfer(address from, address to, uint256 value) internal {
      require(to != address(0));

      _balances[from] = _balances[from].sub(value);
      _balances[to] = _balances[to].add(value);
      emit Transfer(from, to, value);
  }

  /**
   * @dev Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param account The account that will receive the created tokens.
   * @param value The amount that will be created.
   */
  function _mint(address account, uint256 value) internal {
      require(account != address(0));

      _totalSupply = _totalSupply.add(value);
      _balances[account] = _balances[account].add(value);
      emit Transfer(address(0), account, value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burn(address account, uint256 value) internal {
      require(account != address(0));

      _totalSupply = _totalSupply.sub(value);
      _balances[account] = _balances[account].sub(value);
      emit Transfer(account, address(0), value);
  }

  /**
   * @dev Approve an address to spend another addresses' tokens.
   * @param owner The address that owns the tokens.
   * @param spender The address that will spend the tokens.
   * @param value The number of tokens that can be spent.
   */
  function _approve(address owner, address spender, uint256 value) internal {
      require(spender != address(0));
      require(owner != address(0));

      _allowed[owner][spender] = value;
      emit Approval(owner, spender, value);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account, deducting from the sender's allowance for said account. Uses the
   * internal burn function.
   * Emits an Approval event (reflecting the reduced allowance).
   * @param account The account whose tokens will be burnt.
   * @param value The amount that will be burnt.
   */
  function _burnFrom(address account, uint256 value) internal {
      _burn(account, value);
      _approve(account, msg.sender, _allowed[account][msg.sender].sub(value));
  }
}

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract ERC20Burnable is ERC20 {

  /**
   * @dev Burns a specific amount of tokens.
   * @param value The amount of token to be burned.
   */
  function burn(uint256 value) public {
    _burn(msg.sender, value);
  }

  /**
   * @dev Burns a specific amount of tokens from the target address and decrements allowance
   * @param from address The address which you want to send tokens from
   * @param value uint256 The amount of token to be burned
   */
  function burnFrom(address from, uint256 value) public {
    _burnFrom(from, value);
  }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address private _owner;

  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );

  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() internal {
    _owner = msg.sender;
    emit OwnershipTransferred(address(0), _owner);
  }

  /**
   * @return the address of the owner.
   */
  function owner() public view returns(address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(isOwner());
    _;
  }

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0));
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

library Percent {
  // Solidity automatically throws when dividing by 0
  struct percent {
    uint num;
    uint den;
  }