Zero a cell if negative

[python25]

Is there a formula, that

If I add up some cell and they come out negative the outcome is always 0 Zero?

I do not want to have any negative numbers.

 

[don't know in dallas]

=if(a1+b1<0,"",a1+b1). Did I understand your question correctly? DiD

 

[Jay Petrulis]

Try,

=MAX(0,your sum formula)

If the result > 0, the sum formula holds. If <=0, the 0 is the max and is returned.