#include<bits/stdc++.h>
using namespace std;
int f(int x,char c){
	if(c=='y'){
		if(x<=1000){
			return 8+5;
		}
		if(x>1000){
			if((x-1000)%500==0){
				return (x-1000)/500*4+8+5;
			}else{
				return ((x-1000)/500+1)*4+8+5;
			}
			
		}	
	}else{
		if(x<=1000){
			return 8;
		}
		if(x>1000){
			if((x-1000)%500==0){
				return (x-1000)/500*4+8;
			}else{
				return ((x-1000)/500+1)*4+8;
			}
		}	
	}
}
int main(){
	int n;char c;
	cin>>n>>c;
	printf("%d",f(n,c));
	return 0;
}