Suggestion for AdSense plugin to fit my needs

Hi there,
I’m looking for a specific Google AdSense plugin that I don’t really know if it exists…

I’ve searched the plugin repository and read most ad related plugins description but I don’t think any fits my needs but if you guys have already tested them, maybe one of them is good for me.

Basically, I want to place only one specific Google AdSense ad after the first post and that’s it for the ads in the posts. I don’t want ads between the post content but only between posts and just one single ad.

Is there a plugin for that?