using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string firstName = "John ";

        string lastName = "Doe";

        string fullName = $"{firstName} {lastName}";

        Console.WriteLine(fullName);

        Console.WriteLine("Enter User");

        string user = Console.ReadLine();

        Console.WriteLine("User Name is: " + user);

    }

}