I want a counter to increment everytime a condition is true.

I have a report with DATA GROUPING. Each line has an AVAILABLE field with a numeric value of 1, 2, or 3. I want a counter to increment each time AVAILABLE=1.

I thought the solution was to add to my VARIABLES list an item (I named) RESPONDED and to have it COUNT, with a VALUE TO STORE of AVAILABLE=1. Apparently not! This simply increments for each entry rather than just the ones that have AVAILABLE=1. I understand why it is doing what it is doing but I don't know how to do what I want to do. Do you???

Idea's???