using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public interface IOwner

    {

        string Name {get;}

    }

    public class Equipment

    {

        public Equipment()

        {

            Owner = new EquipmentOwner();

        }

        public Equipment(string ownerName)

        {

            Owner = new EquipmentOwner {Name = ownerName};

        }

        public IOwner Owner {get; protected set;}

        protected class EquipmentOwner : IOwner

        {

            public string Name {get; set;}

        }

    }

    public class BusinessEquipment : Equipment

    {

        public BusinessEquipment(string companyName)

        {

            Owner = new BusinessOwner(companyName);

        }

        private class BusinessOwner : EquipmentOwner

        {

            internal BusinessOwner(string companyName)

            {

                Name = companyName;

            }

        }

    }

    public class PersonalEquipment : Equipment

    {

        public PersonalEquipment(string personFirstName, string personLastName)

        {

            Owner = new Person(personFirstName, personLastName);

        }

        public class Person: IOwner

        {

            public Person(string firstName, string lastName)

            {

                Name = firstName + " " + lastName;

            }

            public string Name {get; private set;}

        }

    }

}