The power of logic!

Solve this!

A man leaves from Kerela, with three sacks full of 30 coconuts each. He comes across 30 tolls till he reaches Bangalore. He has to give one coconut for each sack containing coconuts as toll tax at every toll. At the maximum, how many coconuts can he have left with him at Bangalore?

Note: This is not a mathematical question. I mean, you need basic addition subtraction etc., but otherwise you need more of logical thinking. And no, there's not some dumb answer, like he dropped some on the way, etc.