The harsh but fair mathematician Maria Pavlovna Trifonova finds out that for the sake of her health she urgently needs to slow down — she even has to drink antidepressants. The doctor also advises to establish communication with her granddaughter Nastya, whom Trifonova hardly sees. This is how an old-school teacher gets into a prestigious school of the future... and realizes that there is no peace here. After all, exact sciences require discipline and attention, and the age of technology has given children problems with both.