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