using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
public class Tree
{
public class Node
{
public int value;
public Node left;
public Node right;
public Node(int v, Node l, Node r)
{
this.value = v;
this.left = l;
this.right = r;
}
}
public Node head = null, templ = null, tempr = null;
public void Add( int value)
{
if (head == null)
{
head = new Node(value, null, null);
}
else
{
Node headtemp = head;
while (true)
{
if (headtemp.value < value)
{
headtemp = headtemp.right;
}
else
if (headtemp.value > value)
headtemp = headtemp.left;
if (headtemp == null)
{
headtemp = new Node(value, null, null);
break;
}
}
}
}
}
static void Main(string[] args)
{
Tree t1 = new Tree();
int n = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i < n; i++)
{
t1.Add(Convert.ToInt32(Console.ReadLine()));
}
Console.ReadLine();
}
}
}