Problem A. A + B
题目连接：
https://opentrains.snarknews.info/~ejudge/team.cgi?SID=c75360ed7f2c7022&all_runs=1&action=140https:/
阅读背景：
Western Subregional of NEERC, Minsk, Wednesday, November 4, 2015 Problem A. A + B
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