Where to insert Adsense Code in Amp.hbs

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Hi there, I just have a quick question relating to inputting the Adsense script inside the amp.hbs file as it needs to be inserted on Amp pages only. Google gives me the following code:

Place this code once in between the head tags of your AMP site’s HTML. This script loads the relevant amp-auto-ads libraries.

<script async custom-element="amp-auto-ads" src="https://cdn.ampproject.org/v0/amp-auto-ads-0.1.js"> </script>

Copy and paste this code immediately after the tag of the pages where you want ads to appear. The placement of the code doesn’t reflect the position of the ad.

<amp-auto-ads type="adsense" data-ad-client="ca-pub-4639928629281949"> </amp-auto-ads>

I was wondering how I can insert this into the default amp.hbs file in the theme. I don’t have a lot of coding experience so I’m not sure exactly where to put it, any help would be appreciated.