Correction on formula using sum and max to negate negative number

I'm trying to input an hour's punch as I'm a manager and I'm not punching my hours officially, but i want to calculate the excess hours.

I need help with writting a formula to only have postive number, no negative.

Here is the formula I'm trying to enter, but having error alert

=Sum(max((0;(f61-c61))-(e61-d61)))

currently having

=SUM(F60-C60)-(E60-D60)

i need help to correct my formula for only showing the result of it, and not the absence of result like now in the cell G61 as the cell F61 is empty.

I would like the G61 only showing a result if both cell are completed. Thats why i dont want a neg number in G61 and inputing a 0 if the result of the formula is negative...

I don't want a negative number on my g column cells.

What would be the correct formula?

Here's a sample of the table im working with.

Thanks