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