Matrix Row Counts

I have a matrix which sums sales to a customer by Month/Year.
Rows - Customer Name, Sum(NetSales)
Columns - Month/Year
What I want to capture is the total number of rows in the matrix.
For example, I am passing the report 144 records from my query; however
there are only 35 distinct customers.
Is there a function or property of the matrix that will give me this
information? I am currently doing a SELECT DISTICT on customer no in
another query to get this result.Using the CountDistinct Aggregate would do the job so you would not
need the second query.