Buy all plane tickets to CA so Jelani can't leave

Everything is perfect. The Harvard Gazette calls Jelani the fastest typer in the world. CS 124 enrollment doubles on an annual basis, and you sleep peacefully knowing that your hash function is almost universal. 

Out of nowhere, you discover that the wife of your professor (the John L. Loeb Associate Professor of Engineering and Applied Sciences) got matched to a residency in Oakland, and so he's decided to leave Harvard and accept a professorship at UC Berkeley. This would spell disaster for CS 124, so to prevent his departure you aim to ensure he cannot make the trip to California. 

You know your professor has not yet purchased his tickets. He's willing to pay any amount for the trip, but if no itinerary exists between BOS and one of {OAK, SFO, SJC}, he and his wife will reluctantly stay. The fate of the course rests on you being able to ensure he stays at Harvard, so don't let everyone down! Help us buy all the plane tickets between Boston and California!

Note: If you actually contribute, we will donate all proceeds to Jelani's organization, AddisCoder, which introduces Ethiopian high schoolers to programming. Website here: https://www.addiscoder.com/