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#!/usr/bin/env python3
with open('express.inp') as fi, open('express.out', 'w') as fo:
a = tuple(map(int, fi.read().split()))[1:]
print(max(
sum(a[:i]) + a[i]*a[i+1] + sum(a[i+2:j]) + a[j]*a[j+1] + sum(a[j+2:])
for i in range(len(a) - 3) for j in range(i + 2, len(a) - 1)), file=fo)
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