Wordpress - Breaking loop for Advertising

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
On my homepage i show 16 posts (little excerpt boxes) on the landing page. all inside a div-box with image and excerpt. i have 2 columns each 8 rows. I like to add an Ad after 4 posts (2 rows). Then again 4 more posts and one more Ad. Another 4 more posts and the last Ad. The Ads i will hardcode by myself.
I can provide the index.php where this loop should happen.
Production time 1 day.

Skills required:
PHP, Wordpress
About the employer:
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