Currently, I'm using a formula to add only positive numbers on my worksheet. the formula I am using in cell B19 is... =sumif(b12+b15+b18,">0", b12+b15+b18). There will be times that any one of these values may be negative and I only want to add positive values. I receive the infamous 'the formula you typed contains an error'. Would someone please assist with a correct formula syntax so I can get past what should be a seemingly easy solution.

Thanks