#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,ans=8;
    char s;
    cin>>a>>s;
    if(a>=1000){
        if(a%500!=0){
            ans=(a/500+1)*4+ans;
            if(s==90){
                ans=ans+5;
                cout<<ans;
            }
            else{
                cout<<ans;
            }
        }
        if(a%500==0){
            ans=(a/500)*4+ans;
            if(s==90){
                ans=ans+5;
                cout<<ans;
            }
            else{
                cout<<ans;
            }
        }
    }
    return 0;
}