UVA1642 魔法GCD Magical GCD

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=825&page=show_problem&problem=4517 [PDF](https://uva.onlinejudge.org/external/16/p1642.pdf)

Input Format

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Output Format

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