using System;

public class Program

{

    public static void Main()

    {

        int i;

        Console.WriteLine("Enter the number: ");

        //cannot directly save any integer input, since by default all will be string. 

        i= Convert.ToInt32(Console.ReadLine());

        if(i%2==0)

        {

            Console.WriteLine("{0} is a prime number", i);

        }

        else

        {

            Console.WriteLine("{0} is a not a prime number", i);

        }

    }

}