function reduceTime()
        modifyCountdownVerify()
        senderVerify()
        public
        payable
    {
        uint256 _rId = rId;
        uint256 _sId = sId;
        uint256 _amount = msg.value;
        uint256 _targetExpectedAmount = getStageTargetAmount(_sId);
        uint256 _targetAmount = 
            stage[_rId][_sId].dividendAmount <= _targetExpectedAmount ?
            _targetExpectedAmount : stage[_rId][_sId].dividendAmount;
            _targetAmount = _targetAmount.mul(100) / 88;
        uint256 _costAmount = _targetAmount.mul(30) / 100;
        
        if(_costAmount > 3 ether)
            _costAmount = 3 ether;
        require(_amount >= _costAmount, "Not enough price");
        
        stage[_rId][_sId].start = now - stageDuration + 900;
        
        cardList[5].playerAddress.send(_costAmount / 2);
        developerAddr.send(_costAmount / 2);
        
        if(_amount > _costAmount)
            msg.sender.send(_amount.sub(_costAmount));
        
    }