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,))]

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

ans=0
for s1,s2,s3,s4 in x:
  mx1,mx2,mx3,mx4=0,0,0,0
  for i in range(n):

    tmp1=1
    for j in s1:
      tmp1*=a[i][j]
    mx1=max(tmp1,mx1)

    tmp2=1
    for j in s2:
      tmp2*=a[i][j]
    mx2=max(tmp2,mx2)

    tmp3=1
    for j in s3:
      tmp3*=a[i][j]
    mx3=max(tmp3,mx3)

    tmp4=1
    for j in s4:
      tmp4*=a[i][j]
    mx4=max(tmp4,mx4)

  ans=max(ans,mx1*mx2*mx3*mx4)
  #print(s1,mx1,s2,mx2,s3,mx3,s4,mx4,mx1*mx2*mx3*mx4)

print(ans)