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#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
char c;
cin>>n>>c;
if(n<=1000){
if(c=='y'){
cout<<"13";
return 0;
}else{
cout<<"8";
return 0;
}
}else{
int m=n-1000;
int sum=m/500;
if(m%500>0){
sum++;
}
if(c=='y'){
cout<<13+sum4;
return 0;
}else{
cout<<8+sum4;
return 0;
}
}
return 0;
}