Starring: Maria Aronova Efim Shifrin Roman Mayakin Igor Khripunov Anastasia Imamova Nadezhda Zharycheva Pavel Savinkov Evgeny Mikheev Anastasia Kipina Daniel Barnes. Maria Trifonova is a real "old—school" mathematician, the last "Teacher of the Year of the USSR". In her lessons, children are not only afraid to reach for their phones, but they don't even breathe without permission. Unexpectedly, she finds herself in an elite school — all for the chance to establish a relationship with her only granddaughter, whom she has not seen for many years due to a conflict with her daughter. Maria is faced with an unusual approach to learning: freedom, technology, and the spoiled children of the rich reign here. Now she has to instill a love for mathematics in the modern generation and find a common language with her closest people.