As much math and foreign languages as you can manage. Make sure that you achieve real competence in one of the languages. "He ... believed a competent person p

As much math and foreign languages as you can manage. Make sure that you achieve real competence in one of the languages. "He ... believed a competent person primarily has the ability to take things from one field of knowledge and apply them to others in creative ways." Well, he's right. But you have to have the information to work with. By the way, lot of philosophy majors discover that they don't want to be in academia (or do, but can't get tenure) and that computing not only requires an ability for abstract thinking but rewards it well.