How do I add a count to a navigation template?

perch_item_zero_index does not seem to work;

<perch:before>
<ul>
</perch:before>
        <li>Page Number (<perch:content id="perch_item_zero_index" />) <a href="<perch:pages id="pagePath" />" title="<perch:pages id="pageTitle" />"><perch:pages id="pageNavText" /></a></li>
<perch:after>
</ul>
</perch:after>