conditional statement for adsense

[mac834]

I am trying to get adsense to appear after the last post on a page, but only if the page has 3 or more posts.

Here is what I have so far at the bottom of the postbit template:

Code:

<if ($postcounter - 1) % ($mybb->settings['postsperpage']) == "2" then> adsense code here </if>

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This shows an ad after the 3nd post only, but I can not figure how to make it show it AFTER the last post, IF there are 3 or more posts.

Example: If a page had 8 posts, it would show the ad after the 8th post, if it had 4 posts, it would show it after the 4rd, if it had 10 posts, it would show it after the 10th post.  Note that that is the number of posts per page and not per thread.