import sys


def input():
    return sys.stdin.readline()[:-1]


def main():
    N, K = map(int, input().split())

    ans = (2**N) // (2**K)
    print(ans)


if __debug__:
    main()
else:
    import pprint

    with open(sys.argv[1], "r") as f:
        sys.stdin = f
        main()