#include <stdio.h>
int main() 
{
 int a,x;
    char c;
    scanf("%d %c",&a,&c);
          switch(c)
          {
            case 'y':
            if(a>0&&a<=1000)
            printf("13");
            else {
                if(a%500==0){
            x=((a-1000)/500)*4+5+8;
            printf("%d",x);}
            else {
            x=((a-1000)/500+1)*4+8+5;
            printf("%d",x);}    
            break;}
            case 'n':
               if(a>0&&a<=1000)
            printf("8");
            else {
                if(a%500==0){
            x=((a-1000)/500)*4+8;
            printf("%d",x);}
            else {
            x=((a-1000)/500+1)*4+8;
            printf("%d",x);}  
            }
              break;
          }
    
    
    return 0;
}