Toll Trolls

Johnny has gone on a short excursion to the island of Bitland, and found himself with plenty of time to spare for sight-seeing. As a matter of fact, he does really have any itinerary at hand. All he would like to do is to walk around a bit, without spending too much money in the process. The cities of Bitland are connected by a network of one way streets. If there exists a road leading directly f