Flappy math!

What? Do you have a little problem with math? Can't do quick math in your head? 

No problem! This game is just for you! It will help you develop your ability to quickly count in your head, and will also give you a little skill in thinking through subsequent moves. 

The game is simple: You are a duck. Your task is to collect books and solve examples, but be careful! Along with books, air mines fly in your direction. I don't advise you to crash into them. Collect points, live as far as possible, develop and evolve! IRL, not in game. 

Controls: up arrow - you will take off. Numbers on the keyboard - you will type the answer. If you accidentally wrote an extra letter, press the back space. If you think the answer is correct, then press enter. 

You should also remember: if you skip the book OR don't give the correct answer 3 times in a row, then you lose. And the longer you play, the less time you have to answer

Warning: the sound may be too loud, so I advise you to die and adjust the sound, and then continue the game. I warned you