Stop in for a cup of coffee

1-6-78-2-17? 1-6 is -5. -5-78 is -83. -83-2 is -85. -85-17 is -102... hello?! :lol:
Nah, you mistook it for an equation...it's actually the locker combination for where the Hoppy prize is stashed at the Greyhound station.