How do I assign points for posts and replies in a Discussion?

I have 13 possible discussion topics over the course of the semester. Each student must participate in 10 of the 13. To "participate," the student must answer a discussion question (worth 10 points) and respond to at least two peers (each response is worth 5 points). That much is all set up beautifully and it works without a flaw. HOWEVER, I don't know how to account for this structure in the grade book. How do I let the students know how they're doing on their discussions (short of periodic check-ins, which are what I've been doing)? Thanks!