Status: 2009-1 Integer or not

So far 5 solutions were submitted but I am not sure whether any of them is absolutely correct. They (이병찬, 류연식, 권상훈, 김린기, 조강진) will all receive 2 points each.
Here is the origin of typical mistakes: if x|z and y|z, then xy|z.
The problem remains open.

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