Помогите добавить количество товаров при добавлении в корзину

<?if($arParams["USE_PRODUCT_QUANTITY"]):?>
   <form action="<?=POST_FORM_ACTION_URI?>" method="post" enctype="multipart/form-data">
   <table border="0" cellspacing="0" cellpadding="2">
      <tr valign="top">
         <td><?echo GetMessage("CT_BCE_QUANTITY")?>:</td>
         <td>
            <input type="text" name="<?echo $arParams["PRODUCT_QUANTITY_VARIABLE"]?>" value="1" size="5">
         </td>
      </tr>
   </table>
   <input type="hidden" name="<?echo $arParams["ACTION_VARIABLE"]?>" value="BUY">
   <input type="hidden" name="<?echo $arParams["PRODUCT_ID_VARIABLE"]?>" value="<?echo $arOffer["ID"]?>">
   <input type="submit" name="<?echo $arParams["ACTION_VARIABLE"]."BUY"?>" value="<?echo GetMessage("CATALOG_BUY")?>">
   <input type="submit" name="<?echo $arParams["ACTION_VARIABLE"]."ADD2BASKET"?>" value="<?echo GetMessage("CT_BCE_CATALOG_ADD")?>">
   </form>
<?else:?>