using System;

​

namespace Abstraction

{

    public class Program

    {

        public  class Shipping

        {

            public string delivery{ get; set; }

            public bool calculate(){ return true;}

        }

        public static void Main(string[] args)

        {

            Shipping g = new Shipping();

            Console.WriteLine(g.calculate());

            Console.ReadLine();

        }

    }

}