"""

まとめる

"""

import sys
from sys import stdin

N = int(stdin.readline())

C = [list(map(int,stdin.readline().split())) for i in range(N)]

ans = 0

for b in range(6):

    for a in range(b):

        rem = [i for i in range(6)]
        del rem[b]
        del rem[a]

        amax = 0
        for i in range(N):
            amax = max(amax , C[i][a])
        bmax = 0
        for i in range(N):
            bmax = max(bmax , C[i][b])

        for c,d in [ [(rem[0],rem[1]),(rem[2],rem[3])]
                     , [(rem[0],rem[2]),(rem[1],rem[3])]
                     , [(rem[0],rem[3]),(rem[1],rem[2])] ]:

            cmax = 0
            for i in range(N):
                cmax = max(cmax , C[i][c[0]] * C[i][c[1]])

            dmax = 0
            for i in range(N):
                dmax = max(dmax , C[i][d[0]] * C[i][d[1]])

            nans = amax * bmax * cmax * dmax
            if ans < nans:
                #print (a,b,c,d)
                #print (amax,bmax,cmax,dmax,nans)
                ans = nans

for a3 in range(6):
    for a2 in range(a3):
        for a1 in range(a2):

            amax = 0
            for i in range(N):
                amax = max(amax , C[i][a1] * C[i][a2] * C[i][a3])

            tans = amax
            for i in range(6):
                if i in (a1,a2,a3):
                    continue
                nmax = 0
                for j in range(N):
                    nmax = max(nmax , C[j][i])
                tans *= nmax

            ans = max(ans , tans)

print (ans)