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B. Maximum Value

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputYou are given a sequence *a* consisting of *n* integers. Find the maximum possible value of (integer remainder of *a* _{ i} divided by *a* _{ j}), where 1 ≤ *i*, *j* ≤ *n* and *a* _{ i} ≥ *a* _{ j}.

Input

The first line contains integer *n* — the length of the sequence (1 ≤ *n* ≤ 2·10^{5}).

The second line contains *n* space-separated integers *a* _{ i} (1 ≤ *a* _{ i} ≤ 10^{6}).

Output

Print the answer to the problem.

Examples

Input

3

3 4 5

Output

2

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