Hi all! This round is prepared by me, caustique, Longarithm, KAN, malcolm. I thank Gerald, who has organised our work and helped us with tricky situations, MikeMirzayanov for the system of organasing contest Delinur for the translation.
I hope that all problems will be OK and everyone will find intersesting problem for him/her.
I apologise for the mistakes in statements. I will be more careful in the next time.