COUNTIFS - Counting in order in one column, Counting only specific cells In another

I probably described this terribly in the topic, but here's the issue:


I have a sheet full of unique entries (each row is a new entry) -- column A has the identification for each participant. Participants can have multiple entries.

I'm able to easily count (in order) each unique record depending on participant ID, using =COUNTIF($A$1:A2,A2).


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PROBLEM: Not every entry is considered "VALID." Whether or not the entry is considered valid is contained in a different cell in the same row. That column only has "VALID" or "INVALID."

I want to be able to count, in order (i.e. 1, 2, 3) only the VALID entries. The INVALID entries would ideally be blank or have something distinguishing them.

What results are you expecting; 1,2, etc for VALID only entries?