// editor3
#include<stdio.h>
int main()
{
    int yearOfService;
    scanf("%d", &yearsOfService);
    if(yearsOfService >= 1 && yearsOfService <= 5)
    {
        printf("5%%\n");
    }
    else if (yearsOfService >= 6 && yearsOfService <= 10)
    {
        printf("10%%\n");
    }
    else if (yearsOfService <=10)
    {
        printf("15%%\n");
    }
    else
    {
        printf("Invalid Input");
    }
    return 0;
}