""" γΎγ¨γγ """ 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)