How do I reset a "counter"?

[Liwet]

I'm doing the Multiply level but I've only gotten as far as two counters. The first one is simple enough and I've found a way to get it to stop counting using a second counter. Once the second counter reaches a certain value, the first counter can increment up, and I can start the process over again.

The problem I'm having is I don't know how to reset the second counter. It will count up to a certain value, but then it will continue to count beyond that value. I want some way to get it to reset to 0 or to its initial state once it reaches the number I'm counting up to.

Any tips (but not solutions)?

[vapier]

(apologies, but memory is a little dusty)

doesn't this board have comparator & input selector modules? comparator takes any two inputs and generates 0/1, and if you feed that to the input selector module's select line, you should be able to toggle between a counter and a constant 0.