I have a sheet that has several groups of nmbers and then a space between
then. each opf these digits represents a sale of a product. For Example:

1
5
8
4
(Empty Cell)
5
6
7
9

the first set of numbers are for product a and the second is for product B.
I would like to count the numbers from the first cell of the product up till
the blank cell. So...
COUNT(FIRST CELL:FIRST EMPTY CELL)

I can not seem to find an easy way to do this. Any suggestions?