#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,sum=0;
    char b;
    cin >>a >>b;
    if(a<=1000&&b=='y'){
        cout <<13;
    }else if(a<=1000&&b=='n'){
        cout <<8;
    }else if(a>1000&&b=='n'){
        while(a-1000>500){
            sum=sum+4;
        }
        if(1000+sum/4*500==a){
            cout <<8+sum;
        }else{
            cout <<8+sum+4;
        }
    }else if(a>1000&&b=='y'){
        while(a-1000>500){
            sum=sum+4;
        }
        if(1000+sum/4*500==a){
            cout <<8+5+sum;
        }else{
            cout <<8+5+sum+4;
        }
    }
    return 0;
}