计蒜客 T1043 c++

计算邮资

#include 
using namespace std;
int main()
{
    int n,b,c,d;
    char a;
    cin>>n;
    cin>>a;
    if(n<=1000)
    {
        if(a=='y')
        {
            b=8+5;
        }
        else
        {
            b=8;
        }
    }
    else if(n>1000)
    {
        n=n-1000;
        c=n/500;
        d=n%500;
        if(d>0)
          c=c+1;
        else
            c=c;
         if(a=='y')
            b=8+5+c*4;
        else
            b=8+c*4;
    }
    cout<