How to Hide SimpleMap Admin Menus

function plt_hide_simplemap_menus() {
	//Hide "SimpleMap".
	remove_menu_page('edit.php?post_type=sm-location');
	//Hide "SimpleMap → Locations".
	remove_submenu_page('edit.php?post_type=sm-location', 'edit.php?post_type=sm-location');
	//Hide "SimpleMap → Add New Location".
	remove_submenu_page('edit.php?post_type=sm-location', 'post-new.php?post_type=sm-location');
	//Hide "SimpleMap → Location Categories".
	remove_submenu_page('edit.php?post_type=sm-location', 'edit-tags.php?taxonomy=sm-category&post_type=sm-location');
	//Hide "SimpleMap → Location Tags".
	remove_submenu_page('edit.php?post_type=sm-location', 'edit-tags.php?taxonomy=sm-tag&post_type=sm-location');
	//Hide "SimpleMap → General Options".
	remove_submenu_page('edit.php?post_type=sm-location', 'simplemap');
	//Hide "SimpleMap → Import / Export CSV".
	remove_submenu_page('edit.php?post_type=sm-location', 'simplemap-import-export');
	//Hide "SimpleMap → Premium Support".
	remove_submenu_page('edit.php?post_type=sm-location', 'simplemap-help');
}

add_action('admin_menu', 'plt_hide_simplemap_menus', 21);
Where do I put this code?