function changeCats() {

    CModule::IncludeModule('catalog');

    $cats = array();
    $allowed = array();
    $bs = new CIBlockSection;

    $arFilter = Array('IBLOCK_ID'=> IBLOCK_CATALOG);

    $db_list = CIBlockSection::GetList(Array(), $arFilter, true);

    while($ar_result = $db_list->Fetch())
    {
        $cats[$ar_result['DEPTH_LEVEL']][] = $ar_result;
    }

    for ($i = count($cats); $i > 0; $i--) {
        foreach ($cats[$i] as $ar_result){
            $checked = 0;
            $has_products = 0;
            $arSelect = Array("ID", "CATALOG_GROUP_2");
            $arFilter = Array(
                "IBLOCK_ID"=> IBLOCK_CATALOG,
                "ACTIVE"=>"Y",
                "SECTION_ID" => $ar_result['ID'],
                '!CATALOG_QUANTITY' => 0
            );
            $res = CIBlockElement::GetList(Array(), $arFilter, false, Array(false), $arSelect);
            while($ar_fields = $res->GetNext())
            {
                if ($has_products == 0){
                    $has_products = 1;
                }
                if ($ar_fields['CATALOG_PRICE_2'] > 0){
                    $checked = 1;
                }
            }
            if ($checked == 0 && $has_products == 1 && !$allowed[$ar_result['ID']]) {

                $arFields = Array(
                    "UF_NOT_AVAILABLE" => 1
                );
//                echo '<br/>Скрыт раздел: '.$ar_result['NAME'].'--'.$ar_result['ID'];
            } else if ($has_products == 0 && !$allowed[$ar_result['ID']]) {
                $arFields = Array(
                    "UF_NOT_AVAILABLE" => 1
                );
//                echo '<br/>Скрыт раздел: '.$ar_result['NAME'].'--'.$ar_result['ID'];
            } else {
                $allowed[$ar_result['IBLOCK_SECTION_ID']] = 'Y';
                $arFields = Array(
                    "UF_NOT_AVAILABLE" => 0
                );
            }

            $bs->Update($ar_result['ID'], $arFields);

        }
    }

}