import itertools

N = int(input())
ALL = []
MIPCBE = [0]*6
for _ in range(N):
    L = list(map(int, input().split()))
    ALL.append(L)
    for i in range(6):
        MIPCBE[i] = max(MIPCBE[i],L[i])

ans = 0
for l in list(itertools.combinations(range(6), 3)):
    OTHER = list(range(6))
    for i in l:
        OTHER.remove(i)
    v = 1
    for o in OTHER:
        v *= MIPCBE[o]
    v2 = 1
    for mipcbe in ALL:
        temp=1
        for i in l:
            temp*=mipcbe[i]
        v2 = max(temp,v2)
    ans = max(ans,v*v2)

for l in list(itertools.combinations(range(6), 4)):
    OTHER = list(range(6))
    for i in l:
        OTHER.remove(i)
    v = 1
    for o in OTHER:
        v *= MIPCBE[o]

    for i in range(1,4):
        l1 = [0,i]
        l2 = []
        for j in range(1,4):
            if j not in l1:
                l2.append(j)
        ll1 = [l[l1[0]],l[l1[1]]]
        ll2 = [l[l2[0]],l[l2[1]]]

        v2 = 1
        for mipcbe in ALL:
            temp=1
            for i in ll1:
                temp*=mipcbe[i]
            v2 = max(temp,v2)

        v3 = 1
        for mipcbe in ALL:
            temp=1
            for i in ll2:
                temp*=mipcbe[i]
            v3 = max(temp,v3)
        ans = max(ans,v*v2*v3)

print(ans)