#include<stdio.h>
int main()
{
	int x,n;
	char c;
	scanf("%d %c",&x,&c);
	if(x<=1000) n=8;
	else if(x%500==0)
	n=(x/500)*4;
	else n=(x/500+1)*4;
 	if(c=='y') n+=5;
	printf("%d",n);
	return 0;
}

因为1000正好是8元，和后续4元每500克一致，就没有删。错的为2/4/6/9/10