# задание из моего кима
minimal = 1000001
min_n = 1001
a = []
n = int(input())
for i in range(n):
a.append(int(input()))
if len(a) < 7:
continue
if a[0] < min_n:
min_n = a[0]
if a[6]*a[0] < minimal:
minimal = a[0]*a[6]
if a[6]*min_n < minimal:
minimal = a[6]*min_n
del a[0]
print(minimal)
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