About the pricing of Cloudflare Access, how does it count "users"?

I want to use Cloudflare Access to block access of my domain and use a list of allowed mails set in Access Groups to allow the access. However I am not sure how many mails can I set within the free tier. If I have 100 email address then $7 per user exceeds 50 seems unreasonably too expensive. So how does it count the users actually?
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