CodinGame.com to learn?

I went to CodinGame.com today thinking I could use it to learn a language. I started in Python 3 because I've been messing with it for while. I've read in places that this site is a good place to learn. Well, the very first puzzle(supposedly easy) left me completely in the dark. They plugged in some code and part of it was 'import math' and 'import' sys. I got tired of trying firgure out how to crack the puzzle(game) and went to the answer. I noticed one variable was assigned 'iMax'. Am I wrong in assuming this is something from the 'math' imported module? If this is the case, how can they expect a beginner to figure this out? Apparently you have to have a working knowledge of the different modules out there to even begin to solve the very first game.