Bitcoin Riddle! Can You Solve it ? lets Play

Hello Friends, 

Let's play a game to solve Riddle. Sorry for my bad english.

I have 3 Bitcoin Holding Address and Each have maximum 30 Bitcoins. so I have total 90 Bitcoins. Now, I am travelling to a place and I comes across 30 toll tax . The Rules of Toll tax is, I need to pay 1 bitcoin for each bitcoin holding address as toll tax at Every Tolls. So can you guys tell me, How much bitcoins are left when I reached my destinations ?

Note : 0 is not the Right answer.

I will edit the answer later!

Thank You