Uhm...Did you read the premise to this game, Chiara?
The game started at 0 and the way it's played is that the boys count up while the girls count down.
If the boys reach 500 then they win.
If we girls reach -500 then we win. It's like a tug of war, only with numbers.
If you wish to switch sides despite your gender, then the correct number you should have posted would have been a -1.
Also, since we are also relying on genders from both sides to make bloopers, a wrong number counts as well.
So we're back now on
-1