#43

    internal class Program
    {
        private static void Main(string[] args)
        {
            Player player = new Player();
            Seller seller = new Seller();
            Shop shop = new Shop();

            shop.OpenMenu(player, seller);
        }
    }

    class Item
    {
        public Item(string name, int cost)
        {
            Name = name;
            Cost = cost;
        }

        public string Name { get; }
        public int Cost { get; }
    }

    class Human
    {
        protected List<Item> Inventory;

        public Human()
        {
            Inventory = new List<Item>();
        }

        public int Wallet { get; protected set; }

        public void AddItem(Item item)
        {
            Inventory.Add(item);
        }

        public void AddMoney(int money)
        {
            Wallet += money;
        }

        public void ShowItems()
        {
            Console.Clear();
            Console.WriteLine("Список вещей: \n");

            for (int i = 0; i < Inventory.Count; i++)
            {
                Console.WriteLine($"№ {i + 1}| {Inventory[i].Name} | {Inventory[i].Cost} Coin's");
            }
        }
    }

    class Player : Human
    {
        public Player()
        {
            AddMoney(100);
        }

        public void SpendMoney(int money)
        {
            Wallet -= money;
        }

        public bool TryToPurchaseItem(int cost)
        {
            return Wallet >= cost;
        }
    }

    class Seller : Human
    {
        public Seller()
        {
            Inventory = new List<Item>() {
                new Item("Железные доспехи", 30),
                new Item("Зелье роста", 15),
                new Item("Зелье регенерации", 35),
                new Item("Магический посох", 50) };
        }

        public int InventoryCount => Inventory.Count;

        public Item GetItemFromInventory(int index)
        {
            return Inventory[index];
        }

        public void RemoveItemFromInventory(Item item)
        {
            Inventory.Remove(item);
        }
    }

    class Shop
    {
        public void Trade(Seller seller, Player player)
        {
            seller.ShowItems();

            Console.Write("\nВведите номер товара: ");
            if (int.TryParse(Console.ReadLine(), out int itemNumber) == false)
            {
                Console.WriteLine("Некорректный ввод");
                return;
            }

            itemNumber -= 1;
            int countOfSellerItems = seller.InventoryCount;

            if (itemNumber < 0 || itemNumber >= countOfSellerItems)
            {
                Console.WriteLine("Некорректный номер товара");
                return;
            }

            Item item = seller.GetItemFromInventory(itemNumber);

            if (player.TryToPurchaseItem(item.Cost))
            {
                player.SpendMoney(item.Cost);
                player.AddItem(item);
                seller.RemoveItemFromInventory(item);
            }
            else
            {
                Console.WriteLine("У вас недостаточно средств");
            }

        }

        public void OpenMenu(Player player, Seller seller)
        {
            const string ShowInventoryCommand = "1";
            const string ShowItemsCommand = "2";
            const string BuyItemCommand = "3";
            const string ExitCommand = "4";

            bool isWork = true;

            while (isWork)
            {
                Console.Write($"Ваш баланс: {player.Wallet} Coin's");
                Console.WriteLine($"\n{ShowInventoryCommand} ==> Показать инвентарь." +
                    $"\n{ShowItemsCommand} ==> Показать товары в магазине.\n{BuyItemCommand} ==> " +
                    $"Купить предмет.\n{ExitCommand} ==> Выход.");

                Console.Write("\nВыберите действие: ");
                string userInput = Console.ReadLine();

                switch (userInput)
                {
                    case ShowInventoryCommand:
                        player.ShowItems();
                        break;

                    case ShowItemsCommand:
                        seller.ShowItems();
                        break;

                    case BuyItemCommand:
                        Trade(seller, player);
                        break;

                    case ExitCommand:
                        isWork = false;
                        break;

                    default:
                        Console.WriteLine("Некорректный ввод");
                        break;
                }

                Console.WriteLine("\nНажмите любую клавишу чтобы продолжить....");
                Console.ReadKey();
                Console.Clear();
            }
        }
    }