using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        try

        {

            var numbers = new[] { 1, 2, 3 };

            var single = numbers.SingleOrDefault();     

            Console.WriteLine("Hello World");

        }

        catch (Exception e)

        {

            Console.WriteLine(e.ToString());

        }

    }

}