#include<stdio.h>
int main(){
    int yearsOfService;
    scanf("%d",&yearsOfService);
    if(yearOfService >= 1 && yearsOfService <= 5) {
        printf("5%%");
    }else if (yearOfService >= 6&& yearsOfService <= 10) {
        printf("10%%");
    }else if (yearsOfService > 10) {
        printf("15%%");
    }else {
        printf("Invalid Input");
    }    
    return 0;
}