题目网址: http://www.puzzleup.com/2018/
http://www.puzzleup.com/2018/puzzle/?5
答题时限: ８月30日７ＰＭ－比赛结束（约12月12日）
加分时限: ８月30日７ＰＭ－９月5日６：５９ＰＭ
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比赛期间内可随时上传答案，加分时限内答对第ｎ天加（６－ｎ）分　 　　 　
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◆NUMBER SELECTION
Given any X integers (not necessarily distinct), if it is always possible to
select Y of them whose sum is divisible by 7, what is the minimum value of X
and the corresponding value of Y?
Note: X and Y are positive integers.
If the same question were asked for divisibility by 2, the minimum value of X
would be 3 and the corresponding value of Y would be 2.
Enter the minimum X, then the corresponding Y without using a space in between.
给予X个任意整数(可以重复)，一定能从中挑选出Y个数，使其总和能整除于7，则X的最
小值与其相应的Y值呢？
注：X与Y都是正整数。
若题目要求整除于2，则X的最小值会是3，相对应的Y会是2。
输入最小的X，接着相对应的Y，中间无需空格。