CF189A Cut Ribbon

给一长度为n的缎带，要求将其剪成若干长度为a,b,c的缎带，且缎带数量尽可能多。

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In the first example Polycarpus can cut the ribbon in such way: the first piece has length 2, the second piece has length 3. In the second example Polycarpus can cut the ribbon in such way: the first piece has length 5, the second piece has length 2.