Should I take three or four summer classes? I'd be a full-time student

Two of the classes I’m taking (intro to programming and college composition 2) are 12 weeks (started this week) and literary humor is 6 weeks starting at the end of next month. I got up to calc 2 a few years ago but haven’t finished reviewing calc 1. Should I add chemistry, physics with calculus, financial accounting (for knowledge’s sake) or stick to three classes (computer science major)?

Chemistry or physics would be difficult to add onto an already full schedule, especially if you’re not totally up on calc 1 for physics.