100
You're standing next to a fork in the train tracks, with access to the lever that changes the direction the train will take. The train cannot be stopped, and if left as it is, it will run over and kill 5 people standing at the end of the tracks. If, however, you pull the lever the train will change directions, killing the 1 person standing at the end of that fork. What is your course of action?
Your course of action would be to change the direction of the train and kill the 1 person instead of letting the five die.