Thanks for the participation!

1744A - Замена чисел was authored and prepared by 74TrAkToR

1744B - Чётно-нечётные прибавления was authored by fedoseev.timofey and prepared by _overrated_

1744C - Светофор was authored and prepared by Igorbunov

1744D - Делимость на 2^n was authored and prepared by Ziware

1744E2 - Делимые числа (сложная версия) was authored by fedoseev.timofey and prepared by talant

1744F - MEX против MED was authored and prepared by Olerinskiy