#include <stdio.h>

int main() {
    
    int year;
    
    scanf("%d", &year);
    
    if (year <= 1){
        printf("Invalid Input");
        return 0;
    }
    
    if (year > 1 && year <= 5) {
        printf("5%");
    } else if (year > 5 && year <= 10) {
        printf('10%');
    } else {
        printf("15%");
    }
    return 0;
}