#include <bits/stdc++.h>
using namespace std;
int main(){
    long long x,sum = 0,a,b;
    char c;
    cin >> x >> c;
    if (x <= 1000){
        sum += 8;
        if (c == 'y'){
            sum += 5;
        }
    }
    else if (x > 1000){
        sum += 8;
        a = x - 1000;
        if (a % 500 == 0){
            b = a / 500;
            sum += b * 4;
        }
        b = a / 500 + 1;
        sum += b * 4;
        if (c == 'y'){
            sum += 5;
        }
    }
    cout << sum;
    return 0;
}