calc.PAGE_NUMBER in MX7 Reports - lastpage?

I am new to CF Reports - I want to suppress a footer on the last page of the report (a unit group summary prints on it). In the expression builder, I can do something like calc.PAGE_NUMBER LT 5 for this footer. This report is usually 5 pages, but occasionally it is longer. I think there would be values like a max page or last page and cannot find anything in the literature. Thanks if you can help!