第四题

a_list=[31,28,31,30,31,30,31,31,30,31,30,31]
year=int(input("请输入年份"))
month=int(input("请输入月份"))
day=int(input("请输入天数"))
if year%4==0 and year%400==0 or year%100!=0:
    a_list[1]=29
    b=sum(a_list[:(month-1)])+day
    print(b)
else: 
    b=sum(a_list[:(month-1)])+day
    print(b)