using System;

public class Program

{

    public static void Main()

    {

        int b;

        double a,total;

        b=10;total=3;

        a = Convert.ToDouble(Console.ReadLine());

        if ( a>b){

            total += b+1;

            total = (b-1)*(a+5)*a;

            total += b-1;

        }

        Console.WriteLine(total);

    }

}