Help on a math problem

Правка en1, от rsazid99, 2016-12-11 21:47:39

http://codeforces.net/contest/724/problem/C

I have been trying to solve this problem , but i don't have any ideas. can anyone help me ?? Thanks in Advance :)

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en1 Английский rsazid99 2016-12-11 21:47:39 185 Initial revision (published)