更简单的题解

#include<iostream>
using namespace std;
    int main(){
        int weight,money;
        char m;
        cin>>weight>>m;
        if(weight<=1000){
            money=8;
        }
        if(weight>1000){
           money+=((weight-1000)/500+1)*4; 
        }
        if(m=='y'){
            money+=5;
        }
        cout<<money;
        return 0;
    }