function getEarlyIncomeByAddress(address _buyer)
        public
        view
        returns(uint256)
    {
        uint256 _sum = earlyIncomeScannedSum[_buyer];
        uint256 _fromRound = lastWithdrawnRound[_buyer] + 1; 
        if (_fromRound + 100 < curRoundId) _fromRound = curRoundId - 100;
        uint256 _rId = _fromRound;
        while (_rId <= curRoundId) {
            _sum = _sum + getEarlyIncomeByAddressRound(_buyer, _rId);
            _rId++;
        }
        return _sum;
    }