Batman went to casinos
It is said that one day, Batman decided to put aside his jobs and take a rest. He went to the first casino and paid 5$ for the entrance fee. He managed to win and double his current money. When he walked out, he had to pay 5$ for the Batman Supercar parking fee. He went to the second casino, also paid 5$ for the entrance fee, and doubled his money. However, after paying 5$ for parking, Batman found out that he had no money left. How much money (in dollars) did Batman have at first?