LiveCycle - Dropdown text value to be calculated in repeatable Subform

Hello,

I have a dropdown with two text selections (Account, Survey) in a repeatable Subform. 

Then I have two fields adding the selections.  # of Accounts per Region____  # of Surveys per Region ___.

If I add 10 repeatable rows selecting Account 6 times and Survey 4 times, how to write the script or form calc to sum the selections?

Thank you!