using System;

public class Program

{

    public static void Main()

    {

        int num;

​

        Console.WriteLine("Enter an integer:");

        while (!int.TryParse(Console.ReadLine(), out num))

        {

            Console.WriteLine("Invalid input. Please enter a valid integer:");

        }

​

        if (IsEven(num))

        {

            Console.WriteLine("The number is even.");

        }

        else

        {

            Console.WriteLine("The number is odd.");

        }

    }

​

    static bool IsEven(int num)

    {

        return num % 2 == 0;

    }

}