python上机实验

ans = 0


def A(a, b):
    if b == 0:
        return a
    else:
        return A(b, a % b)


def B(n):
    if n == 10:
        return 1
    else:
        return 2 * (B(n + 1) + 1)


# x = int(input())
# y = int(input())
# print(A(x, y))
# z = int(input())
# print(B(z))