using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public static bool areIdentical(BinaryTreeNode root1, BinaryTreeNode root2) {

      if(root1 == null & root2 == null) return true;

      if(root1 != null && root2 != null){

        return ((root1.data == root2.data) &&

        areIdentical(root1.right,root2.right) && 

        areIdentical(root1.left,root2.left));

      }

    return false;

  }

}