#include<cstdio>

int main(){

1. double a,c;

2. char b;

3. scanf("%d %c",&a,&b);

4. if(a<=1000&&b=='n'){

5.  printf("8");
   

6. }if(a>1000&&b=='n'){

7.  c=(int)((a+499)/500)*4;
   

8.  printf("%f",c);
   

9. }if(a<=1000&&b=='y'){

10. c=8+5;
    

11. printf("%f",c);
    

12. }if(a>1000&&b=='y'){

13. c=(int)((a+499)/500)*4+5;
    

14. printf("%f",c);
    

    }

    return 0; }