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