from itertools import product

N=int(input())

S=[]
for i in range(N):
    S.append(list(map(int,input().split())))

X=0
for A in product(range(4),repeat=6):
    T=[1,1,1,1]

    for i in range(N):
        V=[1,1,1,1]
        for k in range(6):
            V[A[k]]*=S[i][k]

        for j in range(4):
            T[j]=max(T[j],V[j])

    X=max(X,T[0]*T[1]*T[2]*T[3])

print(X)