user = input()
user = user.split(" ")

def func_recursion(m,n):
    if m == 0:
        return n + 1
    if m > 0 and n == 0:
        return func_recursion(m-1, 1)
    if m > 0 and n > 0:
        return func_recursion(m-1, func_recursion(m, n-1))


res = func_recursion(int(user[0]), int(user[1]))
print(res)