Tracking no. of times a Condition returns False

See my Flow below. I want to auto-read inbound emails if they exclusively contain .pdf attachments. If they contain any other attachments it should leave it as Unread. My thought is to count the no. of times the Condition in my Flow returns FALSE, and in a next step if count = 0, read the email.

I'm not very familiar with Power Automate and looking through the list of Actions I can't find a way to do this. My solution so far is to always read the email first, and if any non-.pdf attachment is found it unreads it again, but this seems needlessly complex.