The genius of mathematics Mikhail Nefedov teaches probability theory and mathematical statistics at the university. He remembers everything he has ever heard, seen or read. Mikhail learns that his teenage son has a dangerous genetic disease, the treatment of which will require a multimillion-dollar sum. After selling the apartment, Nefedov makes a perfectly calculated bet on a local football league match, but loses. He couldn't have made a mistake, which means there is an unaccounted variable in the equation. And this is an underground betting business where the results of games are rigged to extract illegal income. Mikhail calculates the organizers of the shadow business and demands his winnings from them. This is how the university teacher's war with the betting mafia begins.

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