using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

        public class Car

        {

            public Car(string owner, string maintainer, string designer)

            {

                _owner = owner;

                _maintainer = maintainer;

                _designer = designer;

            }

            private readonly string _owner;

            private readonly string _maintainer;

            private readonly string _designer;

​

            public string Owner => _owner;

            public string Maintainer => _maintainer;

            public string Designer => _designer;

        }

​

        public class TwoTire : Car

        {

            public TwoTire(string owner, string maintainer, string designer, int twoTireVal)

                : base(owner, maintainer, designer)

            {

                _twoTireVal = twoTireVal;

            }

            public TwoTire(Car car, int twoTireVal) //父轉子

                : base(car.Owner, car.Maintainer, car.Designer)

            {

                _twoTireVal = twoTireVal;

            }

            private readonly int _twoTireVal;

            public int TwoTireVal => _twoTireVal;

        }

        public class ThreeTire : Car

        {

            public ThreeTire(string owner, string maintainer, string designer, int threeTireVal)

                : base(owner, maintainer, designer)

            {

                _threeTireVal = threeTireVal;

            }

            private readonly int _threeTireVal;

            public int ThreeTireVal => _threeTireVal;

        }

        public class FourTire : Car

        {

            public FourTire(string owner, string maintainer, string designer, int fourTireVal)

                : base(owner, maintainer, designer)

            {

                _fourTireVal = fourTireVal;

            }

            private readonly int _fourTireVal;

            public int FourTireTireVal => _fourTireVal;

        }

}