How to solve this problem???

Правка en2, от Halym2007, 2022-11-23 08:00:02

link of problem: [problem:https://codeforces.net/problemset/gymProblem/104052/B].i got 70 points but how to get 100 points.I read solution of problem but i can't understand.Please help this problem to get 100 points

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en4 Английский Halym2007 2022-11-23 08:04:37 5 Tiny change: 'lem but i can't unders' -> 'lem but i didn't unders'
en3 Английский Halym2007 2022-11-23 08:03:58 46
en2 Английский Halym2007 2022-11-23 08:00:02 5 (published)
en1 Английский Halym2007 2022-11-23 07:59:17 238 Initial revision (saved to drafts)