#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
int main()
{
int n;
float m;
char a;
cin>>n>>a;
if(a=='y')
{
if(n<=1000)
cout<<13<<endl;
if(n>1000)
{
m=(n-1000)/500;
m=ceil(m);
m=m*4+13;
}
cout<<m<<endl;
}
if(a=='n')
{
if(n<=1000)
cout<<8<<endl;
if(n>1000)
{
m=(n-1000)/500;
m=ceil(m);
m=m*4+8;
}
cout<<m<<endl;
}
return 0;
}