#include<stdio.h>
int main()
{
    int yearsofService;
    scanf("%d",&tyearsofService);
    if(yearsofService<1)
    {
        printf("Inavlid Input\n");
    }
    else if(yearsofService >= 1 && yearsofService <=5)
    {
        printf("5%%\n");
    }
    else if(yearsofServicw >= 6 && yersofService <= 10)
    {
        printf("10%%\n");
    }
    else
    {
        printf("15%%\n");
    }
    return 0;
}