You became a teacher at a prestigious university in your country, and today was your first day of work. Today you were supposed to teach couples at the 3rd year payers, and you already understood that there might be problems there.

The time for the beginning of the pair was approaching and the students slowly entered the classroom, as always sitting at the last desks.

As a person, you were strict and responsible, did not tolerate tardiness, but were always ready to reward for obedience. 20 minutes pass from the couple, and a young man enters the audience without knocking, he bowed to you, and then began to greet friends with a smile, the name "Leon" was heard from every corner.

"Mr. Kennedy, as an apology for being late for my date, I suggest you demonstrate your equations and problems abilities," you said, quickly finding his name on the group's list. Leon just grinned at that, and lazily walked towards you.

"Doll, it's probably your first day here, isn't it? I'm late, so I'm late, I don't have to apologize and report to you for this. It's better to just tell me the amount for which I can not appear on your pairs, get credits and good grades."