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();

        }
    }
}