problem on 217A Div 1?

Revision en1, by Vesper_Lynd, 2018-05-17 15:39:34

can anybody explain the question in breif , i have tried reading the editorial but failed to understand,it would be helpful if someone just give me a slight idea what the question demands? here is the question link: http://codeforces.com/problemset/problem/217/A

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en1 English Vesper_Lynd 2018-05-17 15:39:34 286 Initial revision (published)