CF913A Modular Exponentiation

The following problem is well-known: given integers $ n $ and $ m $ , calculate , where $ 2^{n}=2·2·...·2 $ ( $ n $ factors), and  denotes the remainder of division of $ x $ by $ y $ . You are asked to solve the "reverse" problem. Given integers $ n $ and $ m $ , calculate .

The first line contains a single integer $ n $ ( $ 1

Output a single integer — the value of .

In the first example, the remainder of division of 42 by $ 2^{4}=16 $ is equal to 10. In the second example, 58 is divisible by $ 2^{1}=2 $ without remainder, and the answer is 0.