None, they just all stand around complaining that it won't screw!
Five. Germany to start it, France to try and then give up almost immediately, Italy to start, give up, and try again from the other side, America to finish it and claim credit for the whole thing, and Switzerland to sit in the dark and pretend that nothing happened.
Just two.
Hold On, Not Done Accelerating.
Because he was out standing in his field.
It doesn't matter how many you get, because all they'll do is sit around complaining about how misogynistic the use of the word "screw" is.
Can't complain.