2 circles is if you need to #2, 3 of you need to take a #3.

1+2=3

There’s no place for a number 1. If you’re not going to shit, then you’re not allowed to pee either.

I gotta go, I gotta take a number three.
That’s a piss and a shit and a wank in a tree

youtu.be/sLLQFLXz6VE