Soon (on August 9 at 19:30 MSK) you are lucky to participate in Codeforces Round #195 for Div. 2 participants. Traditionally, Div. 1 participants can take part out of the competition.
Problems have been prepared by me. I want to thank Gerald Agapov (Gerald) for help in preparation of this round, Eugene Sobolev (Seyaua), Vitaly Aksenov (Aksenov239) and Sergey Sukhov (Serega) for testing of problems, Alexander Ignatyev (dudkamaster) for testing of problems and for translation of tutorial, Michael Mirzayanov (MikeMirzayanov) for marvelous Codeforces and Polygon systems, Mary Belova (Delinur) for translation of statements.
We wish everyone good luck and high rating!
UPD: English tutorial
UPD: Congratulations for winners:
Separately, I want to congratulate Egor Kulikov (Egor) — the only person who had passed the all problems!