import sys

sys.setrecursionlimit(6000)
def A(m, n):
    if m == 0:
        return n + 1
    if m > 0 and n == 0:
        return A(m - 1, 1)
    if m > 0 and n > 0:
        return A(m - 1, A(m, n - 1))

m = int(input())
n = int(input())
print(A(m, n))