Can open Open office add?

[Darren Myers]

The reason I ask if it can add is, I don't think it can.... 
 
I found a huge flaw in your program.... the formulas don't work...
 
Example =sum(C5:C15)   with a list of numbers... 4, 5, 4, 3 which should equate 
to 16....  Well in EXCEL it does!!! Your crappy program adds the fucking 
numbers and  comes up with 3...?? WTF    serious fix this most basic problem.