A Max Problem

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Points: 3
Time limit: 1.0s
Memory limit: 64M

Problem type

Max loves to maximize elements. As such, he gives you an array a of length N, and wants you to print the maximum product of any 2 elements in the array! Note that the two elements could both be the same element.

Input Specification

The first line will contain the integer N (1 \le N \le 100).

The next line will contain N integers, a_1, a_2, \ldots, a_N (|a_i| \le 10^9).

Output Specification

Output the maximum product of any two elements.

Sample Input

1 3 2

Sample Output



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