Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw itself in.
or
Seven. One to change it and the other six to sing about how good the old one was.
or
So I went - and I got it.
or
They had reservations.
or
A whole synod. One to move that the bulb be changed while the others debate until the room spins.
or