Hello, everyone! I'm quite excited to invite you to Codeforces Round #439 (Div. 2) which takes place at 16:35 MSK on 6 October.
One of the five problems is created by quailty, and the others are created by me. This is our first round here. The round couldn't have been realized without efforts of: KAN and vintage_Vlad_Makeev.
Besides, I also want to say thanks to our testers: cyand1317, cyand1317