Today's round is mine, as the previous one. This round will be for participants of the second division. Participants of the first division can take part in the round out of competition.
Contest will be in the good old tradition of Codeforces. No any innovations, pretty short and clear statements.
Points for problems are standard: 500-1000-1500-2000-2500.
Good luck everyone!
UPD. Round was ended, ratings was updated.