I'd like to invite you to Codeforces Round #291 (Div. 2). It'll be held on Saturday, February 14 at 19:30 MSK.
Great thanks Maxim Akhmedov (Zlobober), Vasya Antoniuk (Antoniuk) for helping me preparing the contest, to Maria Belova (Delinur) for translating the statements into English, to Mike Mirzayanov (MikeMirzayanov) for the great Polygon platform.
Good luck everyone!
UPD: Score distribution will be the next — 500-1000-2000-2000-2500.
UPD: Editorial. Sorry for the delay)