using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter a number");

        int n= Int32.Parse(Console.ReadLine());

        int r = n % 2;

        bool r1= r == 0;

        switch (r1)

        {

            case true:

                Console.WriteLine("it's an even number");

                break;

            case false:

                Console.WriteLine("it's an odd number");

                break;

        }

    }

}