Question: How do you screw in a screw?
Option 0: Place the screw's pointy end into the appropriate hole. Use the pointy end of a screwdriver and place that into the back of the screw, so that it fits in the grooves. Twist the screwdriver counter-clockwise, so that it's moving the screw counter-clockwise and into the hole. Finish when the screw won't move any more.
Option 1: Place the screw's pointy end into the appropriate hole. Use the pointy end of a screwdriver and place that into the back of the screw, so that it fits in the grooves. Twist the screwdriver clockwise, so that it's moving the screw clockwise and into the hole. Finish when the screw won't move any more.
Answer: 1