function rollDice() payable returns (bool) {
        
        uint oraclizePrice = oraclize_getPrice("WolframAlpha");

        
        if (msg.value < oraclizePrice) {
          return false;
        }

        
        lastPrice = uint2str(oraclizePrice);

        
        oraclize_query("WolframAlpha", "random number between 1 and 6");

        return true;
    }