What's the access level number for admins?

I recently added some code to my site template that queries the membership plugin to check two things:

1. what access level the current logged in user has, then
2. if that access level has permission to see the category the current post is in, show it. Otherwise show a protected message.

However as an admin I am not in an access group, how do I specify that admins have access to everything?

For reference the code I'm using can be found in this topic: