pragma solidity ^0.4.23; 

  

/** 

* @title ERC20Basic 

* @dev Simpler version of ERC20 interface 

* @dev see https://github.com/ethereum/EIPs/issues/179 

*/ 

contract ERC20Basic { 

  function totalSupply() public view returns (uint256); 

  function balanceOf(address who) public view returns (uint256); 

  function transfer(address to, uint256 value) public returns (bool); 

  event Transfer(address indexed from, address indexed to, uint256 value); 

} 

  

/** 

* @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 c) { 

    // Gas optimization: this is cheaper than asserting '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; 

    } 

  

    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 a / b; 

  } 

  

  /** 

  * @dev Subtracts 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 c) { 

    c = a + b; 

    assert(c >= a); 

    return c; 

  } 

} 

  

/** 

* @title Basic token 

* @dev Basic version of StandardToken, with no allowances. 

*/ 

contract BasicToken is ERC20Basic { 

  using SafeMath for uint256; 

  

  mapping(address => uint256) balances; 

  

  uint256 totalSupply_; 

  

  /** 

  * @dev total number of tokens in existence 

  */ 

  function totalSupply() public view returns (uint256) { 

    return totalSupply_; 

  } 

  

  /** 

  * @dev transfer token for 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) { 

    require(_to != address(0)); 

    require(_value <= balances[msg.sender]); 

  

    balances[msg.sender] = balances[msg.sender].sub(_value); 

    balances[_to] = balances[_to].add(_value); 

    emit Transfer(msg.sender, _to, _value); 

    return true; 

  } 

  

  /** 

  * @dev Gets the balance of the specified address. 

  * @param _owner The address to query the the balance of. 

  * @return An uint256 representing the amount owned by the passed address. 

  */ 

  function balanceOf(address _owner) public view returns (uint256) { 

    return balances[_owner]; 

  } 

  

} 

  

/** 

* @title ERC20 interface 

* @dev see https://github.com/ethereum/EIPs/issues/20 

*/ 

contract ERC20 is ERC20Basic { 

  function allowance(address owner, address spender) 

    public view returns (uint256); 

  

  function transferFrom(address from, address to, uint256 value) 

    public returns (bool); 

  

  function approve(address spender, uint256 value) public returns (bool); 

  event Approval( 

    address indexed owner, 

    address indexed spender, 

    uint256 value 

  ); 

} 

  

/** 

* @title Standard ERC20 token 

* 

* @dev Implementation of the basic standard token. 

* @dev https://github.com/ethereum/EIPs/issues/20 

* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol 

*/ 

contract StandardToken is ERC20, BasicToken { 

  

  mapping (address => mapping (address => uint256)) internal allowed; 

  

  

  /** 

   * @dev Transfer tokens from one address to another 

   * @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) 

  { 

    require(_to != address(0)); 

    require(_value <= balances[_from]); 

    require(_value <= allowed[_from][msg.sender]); 

  

    balances[_from] = balances[_from].sub(_value); 

    balances[_to] = balances[_to].add(_value); 

    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); 

    emit Transfer(_from, _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) { 

    allowed[msg.sender][_spender] = _value; 

    emit Approval(msg.sender, _spender, _value); 

    return true; 

  } 

  

  /** 

   * @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 Increase the amount of tokens that an owner allowed to a spender. 

   * 

   * approve should be called when allowed[_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 

   * @param _spender The address which will spend the funds. 

   * @param _addedValue The amount of tokens to increase the allowance by. 

   */ 

  function increaseApproval( 

    address _spender, 

    uint _addedValue 

  ) 

    public 

    returns (bool) 

  { 

    allowed[msg.sender][_spender] = ( 

      allowed[msg.sender][_spender].add(_addedValue)); 

    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); 

    return true; 

  } 

  

  /** 

   * @dev Decrease the amount of tokens that an owner allowed to a spender. 

   * 

   * approve should be called when allowed[_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 

   * @param _spender The address which will spend the funds. 

   * @param _subtractedValue The amount of tokens to decrease the allowance by. 

   */ 

  function decreaseApproval( 

    address _spender, 

    uint _subtractedValue 

  ) 

    public 

    returns (bool) 

  { 

    uint oldValue = allowed[msg.sender][_spender]; 

    if (_subtractedValue > oldValue) { 

      allowed[msg.sender][_spender] = 0; 

    } else { 

      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue); 

    } 

    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); 

    return true; 

  } 

  

} 

  

/** 

* @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 public owner; 

  

  

  event OwnershipRenounced(address indexed previousOwner); 

  event OwnershipTransferred( 

    address indexed previousOwner, 

    address indexed newOwner 

  ); 

  

  

  /** 

   * @dev The Ownable constructor sets the original `owner` of the contract to the sender 

   * account. 

   */ 

  constructor() public { 

    owner = msg.sender; 

  } 

  

  /** 

   * @dev Throws if called by any account other than the owner. 

   */ 

  modifier onlyOwner() { 

    require(msg.sender == owner); 

    _; 

  } 

  

  /** 

   * @dev Allows the current owner to relinquish control of the contract. 

   */ 

  function renounceOwnership() public onlyOwner { 

    emit OwnershipRenounced(owner); 

    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; 

  } 

} 

  

/** 

* @title Pausable 

* @dev Base contract which allows children to implement an emergency stop mechanism. 

*/ 

contract Pausable is Ownable { 

  event Pause(); 

  event Unpause(); 

  

  bool public paused = false; 

  

  

  /** 

   * @dev Modifier to make a function callable only when the contract is not paused. 

   */ 

  modifier whenNotPaused() { 

    require(!paused); 

    _; 

  } 

  

  /** 

   * @dev Modifier to make a function callable only when the contract is paused. 

   */ 

  modifier whenPaused() { 

    require(paused); 

    _; 

  } 

  

  /** 

   * @dev called by the owner to pause, triggers stopped state 

   */ 

  function pause() onlyOwner whenNotPaused public { 

    paused = true; 

    emit Pause(); 

  } 

  

  /** 

   * @dev called by the owner to unpause, returns to normal state 

   */ 

  function unpause() onlyOwner whenPaused public { 

    paused = false; 

    emit Unpause(); 

  } 

} 

  

/** 

* @title Pausable token 

* @dev StandardToken modified with pausable transfers. 

**/ 

contract PausableToken is StandardToken, Pausable { 

  

  function transfer( 

    address _to, 

    uint256 _value 

  ) 

    public 

    whenNotPaused 

    returns (bool) 

  { 

    return super.transfer(_to, _value); 

  } 

  

  function transferFrom( 

    address _from, 

    address _to, 

    uint256 _value 

  ) 

    public 

    whenNotPaused 

    returns (bool) 

  { 

    return super.transferFrom(_from, _to, _value); 

  } 

  

  function approve( 

    address _spender, 

    uint256 _value 

  ) 

    public 

    whenNotPaused 

    returns (bool) 

  { 

    return super.approve(_spender, _value); 

  } 

  

  function increaseApproval( 

    address _spender, 

    uint _addedValue 

  ) 

    public 

    whenNotPaused 

    returns (bool success) 

  { 

    return super.increaseApproval(_spender, _addedValue); 

  } 

  

  function decreaseApproval( 

    address _spender, 

    uint _subtractedValue 

  ) 

    public 

    whenNotPaused 

    returns (bool success) 

  { 

    return super.decreaseApproval(_spender, _subtractedValue); 

  } 

} 

  

contract YenCoin is PausableToken { 

string public name = "YenCoin"; 

string public symbol = "YENC"; 

uint8 public decimals = 18; 

uint public INITIAL_SUPPLY = 10000 * 10 ** uint(decimals); 

  

constructor() public { 

  totalSupply_ = INITIAL_SUPPLY; 

  balances[msg.sender] = INITIAL_SUPPLY; 

} 

  

function distribute(address[] addresses, uint256[] amounts) onlyOwner whenNotPaused public { 

     require(addresses.length == amounts.length); 

     for (uint i = 0; i < addresses.length; i++) { 

         super.transfer(addresses[i], amounts[i]); 

     } 

  } 

  

}