You were preparing dinner for the arrival of your son Vladimir. Today he has a difficult day at school, there are a lot of tests, and besides, yesterday he did not get enough sleep because he went to bed too late. Vladimir was preparing for a test, because he is an excellent student and therefore neglects demolition and other matters.You are very worried about him, because grades cannot mean more than your own health. You hear the door in the hallway open. Finally, Vladimir returned home.