x=[((0,), (1,), (2,), (3, 4, 5)),((0,), (1,), (2, 3), (4, 5)),((0,), (1,), (2, 3, 4), (5,)),((0,), (1,), (2, 3, 5), (4,)),((0,), (1,), (2, 4), (3, 5)),((0,), (1,), (2, 4, 5), (3,)),((0,), (1,), (2, 5), (3, 4)),((0,), (1, 2), (3,), (4, 5)),((0,), (1, 2), (3, 4), (5,)),((0,), (1, 2), (3, 5), (4,)),((0,), (1, 2, 3), (4,), (5,)),((0,), (1, 2, 4), (3,), (5,)),((0,), (1, 2, 5), (3,), (4,)),((0,), (1, 3), (2,), (4, 5)),((0,), (1, 3), (2, 4), (5,)),((0,), (1, 3), (2, 5), (4,)),((0,), (1, 3, 4), (2,), (5,)),((0,), (1, 3, 5), (2,), (4,)),((0,), (1, 4), (2,), (3, 5)),((0,), (1, 4), (2, 3), (5,)),((0,), (1, 4), (2, 5), (3,)),((0,), (1, 4, 5), (2,), (3,)),((0,), (1, 5), (2,), (3, 4)),((0,), (1, 5), (2, 3), (4,)),((0,), (1, 5), (2, 4), (3,)),((0, 1), (2,), (3,), (4, 5)),((0, 1), (2,), (3, 4), (5,)),((0, 1), (2,), (3, 5), (4,)),((0, 1), (2, 3), (4,), (5,)),((0, 1), (2, 4), (3,), (5,)),((0, 1), (2, 5), (3,), (4,)),((0, 1, 2), (3,), (4,), (5,)),((0, 1, 3), (2,), (4,), (5,)),((0, 1, 4), (2,), (3,), (5,)),((0, 1, 5), (2,), (3,), (4,)),((0, 2), (1,), (3,), (4, 5)),((0, 2), (1,), (3, 4), (5,)),((0, 2), (1,), (3, 5), (4,)),((0, 2), (1, 3), (4,), (5,)),((0, 2), (1, 4), (3,), (5,)),((0, 2), (1, 5), (3,), (4,)),((0, 2, 3), (1,), (4,), (5,)),((0, 2, 4), (1,), (3,), (5,)),((0, 2, 5), (1,), (3,), (4,)),((0, 3), (1,), (2,), (4, 5)),((0, 3), (1,), (2, 4), (5,)),((0, 3), (1,), (2, 5), (4,)),((0, 3), (1, 2), (4,), (5,)),((0, 3), (1, 4), (2,), (5,)),((0, 3), (1, 5), (2,), (4,)),((0, 3, 4), (1,), (2,), (5,)),((0, 3, 5), (1,), (2,), (4,)),((0, 4), (1,), (2,), (3, 5)),((0, 4), (1,), (2, 3), (5,)),((0, 4), (1,), (2, 5), (3,)),((0, 4), (1, 2), (3,), (5,)),((0, 4), (1, 3), (2,), (5,)),((0, 4), (1, 5), (2,), (3,)),((0, 4, 5), (1,), (2,), (3,)),((0, 5), (1,), (2,), (3, 4)),((0, 5), (1,), (2, 3), (4,)),((0, 5), (1,), (2, 4), (3,)),((0, 5), (1, 2), (3,), (4,)),((0, 5), (1, 3), (2,), (4,)),((0, 5), (1, 4), (2,), (3,))]
y=[(0,), (0, 1), (0, 1, 2), (0, 1, 3), (0, 1, 4), (0, 1, 5), (0, 2), (0, 2, 3), (0, 2, 4), (0, 2, 5), (0, 3), (0, 3, 4), (0, 3, 5), (0, 4), (0, 4, 5), (0, 5), (1,), (1, 2), (1, 2, 3), (1, 2, 4), (1, 2, 5), (1, 3), (1, 3, 4), (1, 3, 5), (1, 4), (1, 4, 5), (1, 5), (2,), (2, 3), (2, 3, 4), (2, 3, 5), (2, 4), (2, 4, 5), (2, 5), (3,), (3, 4), (3, 4, 5), (3, 5), (4,), (4, 5), (5,)]

n=int(input())
a=[0]*n
for i in range(n):
  a[i]=list(map(int,input().split()))

d={}
for s in y:
  mx=0
  for i in range(n):
    tmp=1
    for j in s:
      tmp*=a[i][j]
    mx=max(mx,tmp)
  d[s]=mx

ans=0
for s1,s2,s3,s4 in x:
  ans=max(ans,d[s1]*d[s2]*d[s3]*d[s4])

print(ans)