from sys import stdin

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

    x = 2 ** K
    xmax = 2 ** N
    if not K:
        print(xmax)
        return

    cnt = 0
    i = 1
    while 1:
        if x * i <= xmax:
            cnt += 1
        else:
            break
        i += 1
    print(cnt)

input = lambda: stdin.readline()
main()