Q=4096
pat=[[[0 for i in range(6)] for j in range(4)] for k in range(Q)]
for i in range(4):
  for j in range(4):
    for k in range(4):
      for l in range(4):
        for m in range(4):
          for n in range(4):
            pid=i*1024+j*256+k*64+l*16+m*4+n;
            pat[pid][i][0]=1;
            pat[pid][j][1]=1;
            pat[pid][k][2]=1;
            pat[pid][l][3]=1;
            pat[pid][m][4]=1;
            pat[pid][n][5]=1;
N=int(input())
T=[list(map(int,input().split())) for j in range(N)]
gmx=0
for ctr in range(Q):
  ft=1
  for p in range(4):
    pmx=0
    for i in range(N):
      pmx=max(pmx,
          max(1,pat[ctr][p][0]*T[i][0])*
          max(1,pat[ctr][p][1]*T[i][1])*
          max(1,pat[ctr][p][2]*T[i][2])*
          max(1,pat[ctr][p][3]*T[i][3])*
          max(1,pat[ctr][p][4]*T[i][4])*
          max(1,pat[ctr][p][5]*T[i][5]))
    ft*=pmx
  gmx=max(ft,gmx)
print(gmx)