Routing with variables

Hi,

Below is my routing but I can't get the last uri segment in to the function.

PHP Code:

$routes->get('/admin/reports/stores/:num', 'Admin/Reports/Brands::stores/$1',['filter'=>'accessfilter']); 


here is the function

PHP Code:

public function stores($id = false){
    echo $id;
} 


not sure what I'm doing wrong here