1004: [递归]母牛的故事（python)：（本地测试正确；但提交不对！！？？）求教

# 小母牛的故事：list求解
def calc_all_cow(year=4):
    ‘‘‘
    使用递归,母牛每第四年产一只，初始为1，计算第year年的母牛总数。
    f(n) = f(n-3) + f(n-1)
    ‘‘‘
    num = 1
    if year > 0 & year < 56:
        if year == 1:
            num = 1
            return num
        elif 1 < year < 5:
            num = year
            return num
        else:
            num = calc_all_cow(year-1) + calc_all_cow(year-3)
            return num


year = [None]
year[0] = int(input())
if year[0]!=0:
    while True:
        temp = int(input())
        if temp == 0:
            break
        else:
            year.append(temp)
            
for i in year:
    num = calc_all_cow(i)
    print(num)