function __callback(bytes32 callbackId, string result, bytes proof) onlyOraclize public {
    require(callbackId == queryId_, "callbackId is error");  
    if (queryTryCount_ == 1) {
      updateGasPrice();        
      checkQueryRandom();
    }
    else {
      queryRandomCallback(callbackId, result, proof);       
    }
  }