Defining root directory for shared hosting

Hi, I just installed Cakephp on a shared host at a2hosting. 

How do I set the root directory in app/index.php  ??

/**

 *  Get Cake's root directory

 */

define('APP_DIR', 'app');

define('DS', DIRECTORY_SEPARATOR);

define('ROOT', dirname(__FILE__));

define('WEBROOT_DIR', 'webroot');

define('WWW_ROOT', ROOT . DS . APP_DIR . DS . WEBROOT_DIR . DS);

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