Just one more.
None. They can't change anything.
One.
Two. One to hold it in place, another to rotate the universe around it.
Just two. One to explain to the public that everything possible is being done to solve the problem, and the other to screw the lightbulb into the water faucet.
A crackhead buys crack so he can put it into his pipe and burn it. A John pays so that he can put his pipe into a crack that might burn him.