I am attempting to get results from the following spreadsheet:

Column D Column N
Product No. Date Sold
11 4/15/04
11 5/15/04
11 9/30/04
18 2/22/04
18 7/4/04
18 8/28/04

I have the total number of product no. 11 sold. From the above data I need
to find out how many of Product No. 11 was sold prior to 5/25/04 and how many
were sold after 5/25/04. I've tried COUNTIF, SUM(IF), COUNT(IF), SUMPRODUCT
as array formulas and not. Any assistance would be appreciated.