import sys
input = sys.stdin.readline

N=int(input())

A=[]

for i in range(N):
    L=list(map(int,input().split()))

    L.sort()
    A.append(L)


DP=[[[-1<<30]*3 for i in range(N)] for j in range(1<<N)]

for i in range(N):
    a,b,c=A[i]

    DP[1<<i][i][0]=c
    DP[1<<i][i][1]=b
    DP[1<<i][i][2]=a


ANS=0
for i in range(1<<N):
    for j in range(N):
        for cc in range(3):
            now=DP[i][j][cc]
            if now<0:
                continue
            ANS=max(ANS,now)

            a,b,c=A[j]

            if cc==0:
                x,y=a,b
            if cc==1:
                x,y=a,c
            if cc==2:
                x,y=b,c

            for to in range(N):
                if i & (1<<to) !=0:
                    continue
                for cc2 in range(3):
                    a2,b2,c2=A[to]

                    if cc2==0:
                        x2,y2=a2,b2
                        z2=c2
                    if cc2==1:
                        x2,y2=a2,c2
                        z2=b2
                    if cc2==2:
                        x2,y2=b2,c2
                        z2=a2

                    if x>=x2 and y>=y2:
                        DP[i|(1<<to)][to][cc2]=max(DP[i|(1<<to)][to][cc2],now+z2)

print(ANS)