how to keep a running tally of boxes filled with info

[fireman175]

Hi, I use a spreadsheet of Excell 2007 to keep track of dates that different
individuals work. There are about 150 persons and everytime they work a day,
I put the date in the next sequencial box to the right of their name.

I need to keep a running total of the total number of boxes filled in. Any
suggestion on how to do this?

Thanks!