#include<iostream>
using namespace std;
int main(){
	int a;
	double b;//a:重量，b:总价
	char c;
	cin>>a>>c;
	if(a<=1000){
		b=8;
	}
	if(a>1000){
		if((a-1000)%500!=0)
		b=8+(a-1000)/500*4+4;
			if((a-1000)%500==0)
			b=8+(a-1000)/500*4;		 
	}
	if(c=='y'){
		b=b+5;
	}
	cout<<b;
	return 0;	
}