class TreeTest
{
   public static void main(String [] args)
   {
       TreeOne to = new TreeOne() ;
       System.out.println(to.isTreeEmpty()) ;
       to.insertToTree(3) ;
       to.insertToTree(2) ;
       to.insertToTree(5) ;
       to.insertToTree(7) ;
       to.insertToTree(3) ;
       System.out.println(to.isTreeEmpty()) ;
       

   }
}