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