function airdrop(uint256 _airdropPrice,uint256 _ethPayment) public airdropAuthed normal returns(uint256){
        computeBonus(0);
        if(_airdropPrice>0&&_ethPayment/_airdropPrice>0&&airdropTotal>0){
            uint256 _airdropAmount = _ethPayment.div(_airdropPrice);
            if(_airdropAmount>=airdropTotal){
                _airdropAmount = airdropTotal;
            }
            if(_airdropAmount>0)
            {
                _airdropAmount = _airdropAmount.mul(10 ** decimals);
                airdropTotal-=_airdropAmount;
                _mintToken(tx.origin,_airdropAmount);
            }
            return _airdropAmount;
        }
        else{
            return 0;
        }
    }