static void Main(string[] args)
{
PhotoAlbum SmallAlbum = new PhotoAlbum();
PhotoAlbum MediumAlbum = new PhotoAlbum(24);
BigPhotoAlbum BigAlbum = new BigPhotoAlbum();
Console.WriteLine("Album n° 1: " + SmallAlbum.GetNumbersOfPages() + " pages");
Console.WriteLine("Album n° 2: " + MediumAlbum.GetNumbersOfPages() + " pages");
Console.WriteLine("Album n° 3: " + BigAlbum.GetNumbersOfPages() + " pages");
Console.ReadLine();
}