Variable for Show Adsense after X posts

Hello guys

What is the variable for show Banner Adsense after a X number of posts/thread?

Thanks

Code:

<!-- / post $post[postid] popup menu -->


<if condition="$post[postcount] % $vboptions[maxposts] == 1 AND $show['guest']">
<div id="inlineleaderboard">
ad code here
</div>
</if>

This code displays after the first post on every page for guests only.