using System;

public class Program

{

    public static void Main()

    {

            string r, fn;

            int ns;

​

            Console.Write("What is your first and last name? ");

            fn = Console.ReadLine();

            Console.Write("Please enter a number from 1-20: ");

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

​

            if (ns < 6)

                r = "You are in the 1st flight.";

            else if (ns < 11)

                r = "You are in the 2nd flight.";

            else if (ns < 16)

                r = "You are in the 3rd flight.";

            else if (ns < 20)

                r = "You are in the 4th flight.";

            else

                r = "Please select a number from 1-20.";

​

            Console.WriteLine("{0}, you have selected {1}. {2}", fn, ns, r);

​

            Console.ReadLine();  

    }

}