Oxygen webhelp server license - how many cores?

I am planning to use Oxygen Webhelp on a Tridion Docs publishing server. Oxygen requires a server license for this, and they sell licenses based on how many "cores" your server has: 2 cores, 4 cores, 8 cores:

https://www.oxygenxml.com/xml_webhelp/buy_oxygen_xml_webhelp.html

Tridion Docs in this case is hosted. My question is, how can I tell how many cores it has, so I can get the right license?

Thanks,

Mark Giffin