In John Wick Parabellum, there is a character "Zero".
(Zero is an assassin employed by the Adjudicator).
There is not much math in the movie. But there is a "bureau" in which
the bounty money is kept track of. Then there are lots of bullets. And there are
different sizes of bullets. An other interesting scene is the pigeons scene in which the
Bowery King (Fishburne) explains why his communications channels have advantages.
Thanks to Pankaj Kamthan for the hint: