public void Demonstrate()
{
Pizza largeP = new LargePizza();
largeP = new Cheese(largeP);
largeP = new Papper(largeP);
largeP = new Ham(largeP);
var MidP = new MediumPizza();
Console.WriteLine($" you have buyed {largeP.GetDescription()} with Price:{largeP.CalculateCost()}");
Console.WriteLine($" you have buyed {MidP.Description} with Price:{MidP.CalculateCost()}");
}