# 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)