大家能帮我看看我的代码吗？为啥是Unaccepted?

n = input().split(" ")
if int(n[0]) <= 1000:
    a=8
else:
    if int(n[0]) %500 == 0:
        a=int(n[0])//500*4   
    else:
        a=(int(n[0])-1000-int(n[0])%500)//500*4+12
if n[1]=="y":
    print(a+5)
else:
    print(a)

写得很烂，请见谅