contract ETH033 is Ownable, RomanLanskoj {

    /* Initializes contract with initial supply tokens to the creator of the contract */
   function ETH033() RomanLanskoj () {}
  mapping (address => mapping (address => uint)) allowed;
  
  function transfer(address _to, uint256 _value) {
        if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough
        if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
        balanceOf[msg.sender] -= _value;                     // Subtract from the sender
        balanceOf[_to] += _value;                            // Add the same to the recipient
        Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
    }
  

  function transferFrom(address _from, address _to, uint _value) onlyPayloadSize(3 * 32) {
    var _allowance = allowed[_from][msg.sender];
    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // if (_value > _allowance) throw;
    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
  }
  function approve(address _spender, uint _value) {
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) throw;
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
  }
   function mintToken(address target, uint256 mintedAmount) onlyOwner {
        balanceOf[target] += mintedAmount;
        totalSupply += mintedAmount;
        Transfer(0, this, mintedAmount);
        Transfer(this, target, mintedAmount);
    }
  function allowance(address _owner, address _spender) constant returns (uint remaining) {
    return allowed[_owner][_spender];
  }
  
  uint256 public sellPrice;
uint256 public buyPrice;

function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
    sellPrice = 3;
    buyPrice = 100;
}
  
  function buy() payable returns (uint amount){
    amount = msg.value / buyPrice;                     // calculates the amount
    if (balanceOf[this] < amount) throw;               // checks if it has enough to sell
    balanceOf[msg.sender] += amount;                   // adds the amount to buyer's balance
    balanceOf[this] -= amount;                         // subtracts amount from seller's balance
    Transfer(this, msg.sender, amount);                // execute an event reflecting the change
    return amount;                                     // ends function and returns
}

function sell(uint amount) returns (uint revenue){
    if (balanceOf[msg.sender] < amount ) throw;        // checks if the sender has enough to sell
    balanceOf[this] += amount;                         // adds the amount to owner's balance
    balanceOf[msg.sender] -= amount;                   // subtracts the amount from seller's balance
    revenue = amount * sellPrice;
    if (!msg.sender.send(revenue)) {                   // sends ether to the seller: it's important
        throw;                                         // to do this last to prevent recursion attacks
    } else {
        Transfer(msg.sender, this, amount);             // executes an event reflecting on the change
        return revenue;                                 // ends function and returns
    }
}
  
}
function ETH033() RomanLanskoj () {}

/* Initializes contract with initial supply tokens to the creator of the contract */