#include<bits/stdc++.h>
using namespace std;
char p;
int ans=8,x;
int main()
{
    cin>>x>>p;
    if(p=='y')ans+=5;
    if(x>1000)
    {
        x-=1000;
        ans+=x/500*4;
    }
    if(x%500!=0)ans+=4;
    cout<<ans;
    return 0;
}