How many cans energy drink do I need in these two weeks?

I am wondering, how many cans of cheap energy drink do I need in these two weeks? 

Purchasing plan today:
1. ten cans for Monday to Friday
2. colour and design of cans are important (blue, orange or lilac??)
3. to my last examinations in my life (hopefully)!!!

Haha, i am going a photo about it here in two weeks, let´s rock!!!

P.S. If I am preparing for exams, usually I am going to eat a lot of foods during that time, without ending. With pommies or chips I can concentrate on learning, and that is real!!!

Have a nice week start, everyone!!