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753. Greatest Greatest Common Divisor
Vaqt limiti: 2 sekund
Xotira limiti: 64 MB

# Andrew has just made a breakthrough in sociology: he realized how to predict whether two persons will be good friends or not. It turns out that each person has an innerfriendship number(a positive integer). And thequality of friendshipbetween two persons is equal to the greatest common divisor of their friendship number. That means there areprimepeople (with a prime friendship number) who just can't find a good friend, andWait, this is irrelevant to this problem. You are given a list of friendship numbers for several people. Find the highest possible quality of friendship among all pairs of given people.

Input

The first line of the input file contains an integer n (2≤n≤106) — the number of people to process. The next n lines contain one integer each, between 1 and 106 (inclusive), the friendship numbers of the given people. All given friendship numbers are distinct.

Output

Output one integer — the highest possible quality of friendship. In other words, output the greatest greatest common divisor among all pairs of given friendship numbers.

Samples

 № Input Output 1 4 9 15 25 16 5