static void Main(string[] args)
{
Flat simpleFlat = new Flat(10, 67, 4);
OneRoomFlat one_room_flat = new OneRoomFlat(11, 355, 3, 67);
TwoRoomFlat two_room_flat = new TwoRoomFlat(11, 355, 3, 67, 45);
simpleFlat.PrintInfo();
one_room_flat.PrintInfo();
two_room_flat.PrintInfo();
Console.ReadKey();
}