#include <iostream>
using namespace std;
int main(){
    int n;
    cin >> n;
    char a;
    cin >> a;
    int b = 0;//邮费
    if(n <= 1000){
        b = 8;
    }else{
        int c = n - 1000;//超出重量的部分
        if(c % 500 == 0){
            c = c / 500 * 4;
        }else{
            c = ( (c / 500) + 1) * 4;  
        }
        b = 8 + c;
    }
    if(a == 'y'){
        b +=  5;
        cout << b;
    }else{
        cout << b; 
    }
    return 0;
}