A thief somehow managed to steal some chocolates from a Mall but while coming out of it at the first door he was caught by the guard and he successfully dealt him by giving 1 chocolate plus half of the rest chocolates. Further he had to pay 2 chocolates and half of the rest to the second guard. Once again at the third gate he gave 3 chocolates and then half of the rest. After that he was left with only one chocolate. How many chocolates had he stolen?
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