猫史档案馆

def get_num(x, y):
    print(x, y, (y == 1 or y == x))
    if y <= 0:
        print("warning")
        return 0
    elif (y == 1 or y == x):
        return 1
    else:
        return (get_num(x - 1, y - 1) + get_num(x - 1, y + 1))
while True:
    n = int(input())
    x = int(input())
    y = int(input())
    print(get_num(x, y))

报错了，输入：

5

3

2

就会出现报错信息，是么原因啊