static void Main(string[] args)
{
Tree tree = new Tree();
tree.AddItem(10);
tree.AddItem(7);
tree.AddItem(9);
tree.AddItem(12);
tree.AddItem(6);
tree.AddItem(14);
tree.AddItem(11);
tree.AddItem(3);
tree.AddItem(4);
tree.AddItem(8);
tree.AddItem(1);
tree.AddItem(5);
tree.AddItem(2);
tree.AddItem(13);
tree.PrintTree();
Console.ReadLine();
}