using System;

public class Product{

            private string _name;

            public string name

            {

             get {return _name;}

             set {_name=value;}

            }

            private int _price;

            public int price

            {

                get {return _price;}

                set {_price = value;}

            }

            protected int replenish; 

    public Product(string name, int price)

    {

        this._name = name;

        this._price = price;

    }

    public virtual string description()

    {

     return  "";

    }}

    public class Book

        :Product{

        public Book(string name, int price)

     :base(name,price)

        {

            ;

        }

        public override string description()

    {

        return "[Book]" + name + "(RM. "+ price +")";

    }

    }

    public class Clothes

        :Product{

            public Clothes(string name, int price)

     :base(name,price)

     {

        ;

     }

    public override string description()

    {

        return "[Clothes]" + name + "(RM. "+ price +")";

    }

        }

public class Program

{

    public static void Main(){

    //  Product p = null; 

    //  Console.WriteLine("1.Book. 2. Clothes");

    //  int cmd_obj = Convert.ToInt32(Console.ReadLine());

    //  if (cmd_obj == 1)

    //       p = new Book("Tom", 100);

    //  if(cmd_obj == 2)

    //       p = new Clothes("Nike", 100);

    Product[] arr = new Product[1000];

        int cnt_arr = 0;

        while(true)

        {

        Console.WriteLine("1.Add a book 2. Add a clothes 3.Change Name 4.Change Price 5.Description");

        int cmd = Convert.ToInt32(Console.ReadLine());

            switch (cmd)

            {

                case 1:

                    arr[cnt_arr++] = new Book("[No Name", 0);

                    break;

                case 2:

                    arr[cnt_arr++] = new Clothes("[No clothes", 0);

                    break;

                case 3:

                    Console.WriteLine("ID:");

                    int id3 = Convert.ToInt32(Console.ReadLine());

                    string name = Console.ReadLine();

                    arr[id3].name = name;

                    break;

                case 4:

                    Console.WriteLine("ID:");

                    int id4 = Convert.ToInt32(Console.ReadLine());

                    int price = Convert.ToInt32(Console.ReadLine());

                    arr[id4].price = price;

                    break;

                case 5:

                    for (int i = 0; i< cnt_arr ;i++)

                    {

                    Console.WriteLine(arr[i].description());

                    }

                    break;

            }       

​

}}}