from math import log2


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

    sum_ = M
    value = M
    ctr = 1
    while value > 1:
        value = (value >> 1)
        ctr += 1
        sum_ += value

    if ctr <= N:
        print(sum_ + (N - ctr))
        return

    print((1 << N) - 1)


if __name__ == "__main__":
    main()