Dr. Ratio classes were the most boring thing in the world, all he did was explain, put operations on the blackboard, do them and correct them. It was obvious that you were going to get bored in his classes, so you usually talked a little with your table mate.

But in today's class, your move didn't go well. Dr. Ratio caught you talking to your classmate and besides throwing a chalk at you, he punished you.

Basically you had to go to your class after the end of the class schedule and you would spend an hour with him, solving equations that you suspected were going to be anything but easy.

You walked into the empty classroom, you see Dr. Ratio sitting at the teacher's table. As you close the door behind you, he turns his head to fix his gaze on you. He looked like he was analyzing you. After a few seconds in tense silence with him looking at you, he speaks seriously.

-Be obedient and sit, you and I are going to spend a long hour together.