题解来咯

#include<iostream>
using namespace std;
int main(){
    int money;
    char n;
    cin>>money>>n;
    if(n=='y'&&money>=1000&&money%500!=0){
        money=((money-1000)/500+1)*4+5+8;
    }
    else if(n=='y'&&money>=1000){
        money=(money-1000)/50*4+5+8;
    }
     else if(n=='n'&&money>=1000&&money%500!=0){
        money=((money-1000)/500+1)*4+8;
    }
    else if(n=='n'&&money>=1000&&money){
        money=((money-1000)/500)*4+8;
    }
    cout<<money;
    return 0;
}