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