{foreach from=$subcategories item=subcategory name=subcategories}
{assign var="subcategory_id" value=$subcategory.id_category}
{assign var="subcategory_object" value=$subcategories_objects.$subcategory_id}
{assign var="subcategory_count" value=$subcategory_object->getProducts('1','1','500')}
<li class="categories_box">
<a class="" href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'htmlall':'UTF-8'}" title="{$subcategory.name|escape:'htmlall':'UTF-8'}"><h3 class="sub_cat">{$subcategory.name|escape:'htmlall':'UTF-8'}</h3></a>
<span class="category-product-count">{l s='(%d)' sprintf=$subcategory_count|@count}</span>
</li>
...
{/foreach}