#include<stdio.h>

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