Four. One to change it, one to sing about how heartbroken he is at the loss of the old one, one to sing about how madly in love he is with the new one, and one to go "Yee-Hah!" and throw his cowboy hat in the air.
One to write a paper claiming that light is a pig whitey invention, one to organize a Darkness Studies program, and one hundred to protest the Diablo Canyon Nuclear Generating Station.