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looool's blog

Number Theory Problem
By looool, 13 years ago, In English
can someone explain how to do this problem http://codeforces.net/contest/134/problem/B
i used dfs that resulted in TLE, number theory tag is given at hints, but i am not able to understand how to do it ?
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13 years ago, # |
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TCO10 Round 1 level 2
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