#include<stdio.h>
void main()
{
    int years;
    scanf("%d",&years);
    if(1<= 5,years)
    {
        printf("5%");
    }else if(6<=10,years)
    {
        printf("10%");
    }else if(10<,years)
    {
        printf("15%");
    }else
    {
        printf("Invalid input")
    }
}