I want to see if someone can help me find a simplied or modified way to
approach a procedure I am doing.

I currently have a spreadsheet that contains 31 worksheets, 1 for each day
in a month. Each worksheet has a column called dept. For each record, the
appropriate dept number is entered. There are ususually between 10-15 depts.
At the end of the month, I need to count how many depts were used throughout
the entire month. I have been physically counting each one by hand. Is there
a better way to accomplish this task without having to waste an entire day of
counting?