def ackermann(m, n): if m == 0: return n + 1 elif m > 0 and n == 0: return ackermann(m - 1, 1) elif m > 0 and n > 0: return ackermann(m - 1, ackermann(m, n - 1)) m, n = input().split() m = int(m) n = int(n) result = ackermann(m, n) print(result)