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