using System;

public class Program

{

    public static void Main()

    {

        double

            x = double.Parse(Console.ReadLine());

         if ((x>=100) && (x<=999))

        {

            Console.WriteLine((x%10)+(x/10)%10 + (x/100));

        }

        else if ((x>=10) && (x<=99))

        { 

            Console.WriteLine(x/10);

        }

        else if (x%2==0)

        {

            Console.WriteLine(Math.Pow(x,2));

        }

            }

}