Iterative script issue

[ploturo]

What is this part of the script supposed to be doing?

          advcur = field[advOrder].value
          for i = 1 to advcur
            if (field[advCost].value = 4) then
              advcount += 1 
              endif
            next

It is checking the same field on the same pick over and over again, so advCount will either be 0 (if field[advCost] isn't 4) or advcur (if field[advCost] is 4)?