Extends Controller Problem

[eluser]Sarwar CSE[/eluser]
The MY_Controller has already in application/core/MY_Controller.php

My question is that is this possible In the file application/controller/adminpanel.php extends system without using

Code:

<?php require_once(APPPATH."controllers/system.php"); ?>

Code:

//file Path: application/controller/adminpanel.php
class adminpanel extends system{
     function __construct(){
         parent::__construct();
      }    
}