[Poi2006]Crystal

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每一行给出数字N,2<=N<=50 下面一行给出N个数字.每个数字在[1,2^32-1]

样例输入


			3

2 1 3

样例输出


			5

And the following are every possible numbers of atoms of each particular element:

(0, 1, 1), (1, 0, 1), (1, 1, 0), (2, 0, 2), (2, 1, 3).