---

using System;
using System.Collections.Generic;

public interface INotification
{
    void SendEmail(string to, string subject, string body);
    void SendSms(string phone, string message);
}

public class OrderProcessor
{
    private EmailNotification _emailNotifier = new EmailNotification();
    private FileLogger _logger = new FileLogger();

    public void Process(Order order, string customerEmail, string customerPhone)
    {
        // Логирование начала обработки
        _logger.Log($"Processing order {order.Id}");

        // Расчёт скидки
        decimal discount = 0;
        if (order.Total > 100) discount = order.Total * 0.1m;
        else if (order.Total > 50) discount = order.Total * 0.05m;
        order.Total -= discount;

        // Отправка уведомлений
        _emailNotifier.SendEmail(customerEmail, "Order processed", $"Total: {order.Total}");
        _emailNotifier.SendSms(customerPhone, $"Order {order.Id} total: {order.Total}");

        // Логирование завершения
        _logger.Log($"Finished processing order {order.Id}");
    }
}

public class EmailNotification : INotification
{
    public void SendEmail(string to, string subject, string body)
    {
        Console.WriteLine($"Sending email to {to}: {subject} - {body}");
    }

    public void SendSms(string phone, string message)
    {
        throw new NotImplementedException("EmailNotification cannot send SMS");
    }
}

public class FileLogger
{
    public void Log(string message)
    {
        // Симуляция записи в файл
        Console.WriteLine($"[LOG] {message}");
    }
}

public class DiscountCalculator
{
    public virtual decimal Calculate(Order order)
    {
        return order.Total * 0.05m;
    }
}

public class SpecialDiscountCalculator : DiscountCalculator
{
    public override decimal Calculate(Order order)
    {
        if (order.Total < 100)
            throw new InvalidOperationException("Special discount only for orders over 100");
        return order.Total * 0.2m;
    }
}

public class Order
{
    public int Id { get; set; }
    public decimal Total { get; set; }
}