maxim khamtsov, gymnasium number one of the city of vitebsk named after alferov, purposeful, resourcefulmathematics teacher, irina petrovna radezh. timofey voitov, secondary school number 2 of the city of dubrovna, named after smirny, brave, active, positive, and his class teacher, teacher of the belarusian language and literature tatyana vladimirovna veremyova. david gorf, secondary school number 6, city of zhodinov. i am sure that without defeat there is no victory. matvey cheley, gymnasium number 33 of the city of minsk, his motto is to study, study and study again, and history teacher tamara mikhailovna fomina. olesya mikhailova, secondary school number 201 in minsk, wants to know everything, but it is impossible to know everything, her class teacher, teacher. i would like to mention another, but no less important person, our scientific expert ekaterina duko, head of the department of methodological support for science and mathematics education at the national institute of education. ekaterina, hello. hello, vasily. hello guys, i wish you a good mood today, an interesting game, quick