I have stumbled upon a Deep Well of knowledge here, now I...

I have stumbled upon a Deep Well of knowledge here, now I understand why my old accountant (God bless him) advised me when I hired a new Accountant, I interview him or her with the following question.
What is one plus one.
If the answer is two, they are the wrong person.
The correct answer is ________?
I have a good accountant. But a doggy adviser I think.
GO BIG