How do I add three variables?

I want monthly totals of how many advances we sent out, and how many collections we took in.

Advances worked fine because there is only one source of money going out.

My measure was fairly simple for that:

NumofAdvances = CALCULATE(COUNTX(TRANHIST,TRANHIST[PRIN_ADVANCE]),TRANHIST[PRIN_ADVANCE]<>0)

However, Collections isn't working because money comes in through three sources: "CORRESP", "PAC", and "REGINST"

My measure is:

NumofCollections =

VAR NumofCORRESP = CALCULATE(COUNTX(TRANHIST,TRANHIST[TRAN_SUBTYPE]),TRANHIST[TRAN_SUBTYPE] = "CORRESP")

VAR NumofPAC = CALCULATE(COUNTX(TRANHIST,TRANHIST[TRAN_SUBTYPE]),TRANHIST[TRAN_SUBTYPE] = "PAC")

VAR NumofREGISNT = CALCULATE(COUNTX(TRANHIST,TRANHIST[TRAN_SUBTYPE]),TRANHIST[TRAN_SUBTYPE] = "REGINST")

VAR Total = NumofCORRESP + NumofPAC + NumofREGISNT

RETURN

Total

However, all it returns to me is this:

What am I missing?

Thanks!

Does this also return a blank?

NumofCollections =
CALCULATE (
    COUNTROWS ( TRANHIST ),
    TRANHIST[TRAN_SUBTYPE] IN { "CORRESP", "PAC", "REGINST" }
)

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