// editor3
#include<stdio.h>
int main(){
    int years_of_service;
    scanf("%d", & years_of_service);
    if(years_of_service >= 1 && years_of_service <=5){
        printf("5%%\n");
    }else if (years_of_service >= 6 && years_of_service <=10) {
        printf("10%%\n");
    }else if(years_of_service > 10){
        printf("15%%\n);
    }else{
        printf("invalid Input\n");
    }
    return 0;
}