//menu post counter

function prefix_nav_description( $item_output, $item, $depth, $args ) {
$original_blog_id = get_current_blog_id();
switch_to_blog(2);
$count_posts = wp_count_posts();
$site1 = $count_posts->publish;
switch_to_blog(3);
$count_posts = wp_count_posts();
$site2 = $count_posts->publish;
switch_to_blog(15);
$count_posts = wp_count_posts();
$site3 = $count_posts->publish;
switch_to_blog(18);
$count_posts = wp_count_posts();
$site4 = $count_posts->publish;
switch_to_blog(20);
$count_posts = wp_count_posts();
$site5 = $count_posts->publish;
switch_to_blog(22);
$count_posts = wp_count_posts();
$site6 = $count_posts->publish;
switch_to_blog(21);
$count_posts = wp_count_posts();
$site7 = $count_posts->publish;
switch_to_blog(6);
$count_posts = wp_count_posts();
$site8 = $count_posts->publish;
switch_to_blog(16);
$count_posts = wp_count_posts();
$site9 = $count_posts->publish;
switch_to_blog(17);
$count_posts = wp_count_posts();
$site10 = $count_posts->publish;
switch_to_blog(19);
$count_posts = wp_count_posts();
$site11 = $count_posts->publish;
switch_to_blog( $original_blog_id );

       $item_output = str_replace( "Volvo", "Volvo ($site1)", $item_output );
	   $item_output = str_replace( "Mazda", "Mazda ($site2)", $item_output );
	   $item_output = str_replace( "BMW", "BMW ($site3)", $item_output );
	   $item_output = str_replace( "Mercedes", "Mercedes ($site4)", $item_output );
	   $item_output = str_replace( "Porsche", "Porsche ($site5)", $item_output );
	   $item_output = str_replace( "Mitsubishi", "Mitsubishi ($site6)", $item_output );
	   $item_output = str_replace( "Hyundai", "Hyundai ($site7)", $item_output );
	   $item_output = str_replace( "Fiat", "Fiat ($site8)", $item_output );
	   $item_output = str_replace( "Ferrari", "Ferrari ($site9)", $item_output );
	   $item_output = str_replace( "Citroen", "Citroen ($site10)", $item_output );
	   $item_output = str_replace( "Renault", "Renault ($site11)", $item_output );


    return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'prefix_nav_description', 10, 4 );