100
Nick looked around the locker room and saw rows of shiny red lockers. There were showers in here, too! Neat! After gym class, Nick threw his gym clothes in the locker. He snapped the door closed and went to take a shower. Then he returned to the locker but it wouldn't open. "You have to know the combination," said the kid next to him. "Uh-oh," thought Nick, "I'm going to be late for my next class."
What is Nick does not know the combination to the lock?