F(x) = 5x¹¹+11x⁵+kax, with (0 <= k <= 10000, 0 <= a). Now give you k, please find the smallest a such that for any positive integer x, F(x) % 55 = 0.

Only one line with an integer k.

If no such a exists, print -1, otherwise print the value of a.

3

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