def akm(m, n): if m == 0: return n + 1 elif m == 1: return n + 2 elif m == 2: return 2 * n + 3 elif m == 3: return (2 ** (n + 3)) - 3 elif n == 0: return akm(m - 1, 1) else: return akm(m - 1, akm(m, n - 1)) m, n = map(int, input().split()) print(akm(m, n))