Couple of days ago I posted a [comment](http://mirror.codeforces.com/blog/entry/58866?locale=ru#comment-424851), where noticed that given algorithm can works in wrong way and got `-61(!)`. Also you can notice, that [comment](http://mirror.codeforces.com/blog/entry/58866?locale=ru#comment-4248651) from [user:MrDindows,2018-04-13] got `+18`, which is IMO is less valuable. I'm not angry with [user:MrDindows,2018-04-13], but I want to understand why I got `-61` ?