Any help with CF#254 A Div1

Revision en1, by AFGhazy, 2015-06-18 18:29:58

http://mirror.codeforces.com/contest/445/problem/C

can any one explain the problem and the answer for me ? the tutorial and the problem statement are so mysterious for me thanks in advance.

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en1 English AFGhazy 2015-06-18 18:29:58 212 Initial revision (published)