Three:
One to write the light bulb removal program,
one to write the light bulb insertion program, and
one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time.
or
Just one, but he'll also want to do something about your nose.
or
Because an undocumented worker has been living on his head for the past 2 decades!
or
The same as a regular year, but with less calories.
or