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