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