pragma solidity ^0.4.18;


contract Ownable {
    modifier onlyOwner() {
        checkOwner();
        _;
    }

    function checkOwner() internal;
}


contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;


    
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    
    modifier whenPaused() {
        require(paused);
        _;
    }

    
    function pause() onlyOwner whenNotPaused public {
        paused = true;
        Pause();
    }

    
    function unpause() onlyOwner whenPaused public {
        paused = false;
        Unpause();
    }
}


contract OwnableImpl is Ownable {
    address public owner;

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

    
    function OwnableImpl() public {
        owner = msg.sender;
    }

    
    function checkOwner() internal {
        require(msg.sender == owner);
    }

    
    function transferOwnership(address newOwner) onlyOwner public {
        require(newOwner != address(0));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}


contract ReadOnlyToken {
    uint256 public totalSupply;
    function balanceOf(address who) public constant returns (uint256);
    function allowance(address owner, address spender) public constant returns (uint256);
}


contract Token is ReadOnlyToken {
  function transfer(address to, uint256 value) public returns (bool);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract MintableToken is Token {
    event Mint(address indexed to, uint256 amount);

    function mint(address _to, uint256 _amount) public returns (bool);
}


library SafeMath {
    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;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        
        uint256 c = a / b;
        
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract ReadOnlyTokenImpl is ReadOnlyToken {
    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) internal allowed;

    
    function balanceOf(address _owner) public constant returns (uint256 balance) {
        return balances[_owner];
    }

    
    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
}


contract TokenImpl is Token, ReadOnlyTokenImpl {
  using SafeMath for uint256;

  
  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);
    emitTransfer(msg.sender, _to, _value);
    return true;
  }

  function emitTransfer(address _from, address _to, uint256 _value) internal {
    Transfer(_from, _to, _value);
  }

  
  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);
    emitTransfer(_from, _to, _value);
    return true;
  }

  
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  
  function increaseApproval (address _spender, uint _addedValue) public returns (bool success) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval (address _spender, uint _subtractedValue) public returns (bool success) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract MintableTokenImpl is TokenImpl, MintableToken, Ownable {
    
    function mint(address _to, uint256 _amount) onlyOwner public returns (bool) {
        totalSupply = totalSupply.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        emitMint(_to, _amount);
        emitTransfer(address(0), _to, _amount);
        return true;
    }

    function emitMint(address _to, uint256 _value) internal {
        Mint(_to, _value);
    }
}

contract FinalToken is Pausable, OwnableImpl, MintableTokenImpl {
    string public constant name = "SET";
    string public constant symbol = "SET";
    uint8 public constant decimals = 18;

    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);
    }
}