The condition of this formula is the following:
If any number from I4:I20 is positive than in the same row C4:C20 number will be considered:
So if I4=232 THAN C4=13 WILL BE CONSIDERED
if I5=-323 than C5=43 WILL NOT BE CONSIDERED
IF I4:I20 HAVE POSITIVE NUMBERS THEN THE SAME ROWS C4:C20...