The owner inherited the hotel. Sometimes he would sit at the front desk and think about the business, and how people ever built infinitely many rooms, and things like that. The owner did not want to lose a customer, so he devised a plan. So the guy from room 1 moved to room 2, the guy from room 2 moved to room 3. The owner did not have to build any new rooms, so nothing has really changed.
Mentor discusses the possibilities.
And everybody moves two rooms up. Mentor and the student discuss who moves where. Usually the student happily explains the solution. Mentor asks him to write down what infinity plus thousand is. All these problems were easy to solve.