Finding number of posts on page (in templates)

Is there a way to get the number of posts on a page?

I've got an ad after the first post and one after the last, but when there's only 1 post on the page we get 2 ads after one another

e.g. *HOW TO CORRECTLY ASK A PILL I.D. QUESTION* - Drugs.com

The code will look like:

HTML Code:

<if is_first_post_condition>
first ad code
<else />
<if is_last_post_condition>
second ad code
</if>
</if>

Thanks, I couldn't get the is_last_post_condition working for some reason, but this worked for me:

Code:

<if condition="$post[postcount]==1 AND !$post['islastshown']">

Yes, "is_last_post_condition" is just a placeholder for the real condition statement The point was to insert last post ad only if it is not the first post at the same time.