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A. Perfect Squares

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputGiven an array *a* _{1}, *a* _{2}, ..., *a* _{ n} of *n* integers, find the largest number in the array that is not a perfect square.

A number *x* is said to be a perfect square if there exists an integer *y* such that *x* = *y* ^{2}.

Input

The first line contains a single integer *n* (1 ≤ *n* ≤ 1000) — the number of elements in the array.

The second line contains *n* integers *a* _{1}, *a* _{2}, ..., *a* _{ n} ( - 10^{6} ≤ *a* _{ i} ≤ 10^{6}) — the elements of the array.

It is guaranteed that at least one element of the array is not a perfect square.

Output

Print the largest number in the array which is not a perfect square. It is guaranteed that an answer always exists.

Examples

Input

2

4 2

Output

2

Input

8

1 2 4 8 16 32 64 576

Output

32

Note

In the first sample case, 4 is a perfect square, so the largest number in the array that is not a perfect square is 2.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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