def akm(m, n): if m == 0: return n + 1 elif m > 0 and n == 0: return akm(m - 1, 1) elif m > 0 and n > 0: return akm(m - 1, akm(m, n - 1)) # 输入 m, n = map(int, input().split()) # 输出 print(akm(m, n))