import sys
import itertools

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

INF = 10**18
N = int(readline())
m = map(int, read().split())
ABC = list(zip(m, m, m))

pattern = [None] * (3 * N)
for i in range(N):
    a, b, c = sorted(ABC[i])
    pattern[3 * i] = (a, b, c)
    pattern[3 * i + 1] = (b, c, a)
    pattern[3 * i + 2] = (a, c, b)
dp = [[-INF] * (3 * N) for _ in range(1 << N)]

for i in range(N):
    for k in range(3):
        dp[1 << i][3 * i + k] = pattern[3 * i + k][2]

for s in range(1 << N):
    for i in range(N):
        if not (s & (1 << i)):
            continue
        for j in range(N):
            if s & (1 << j):
                continue
            t = s ^ (1 << j)
            for k in (3 * i, 3 * i + 1, 3 * i + 2):
                for l in (3 * j, 3 * j + 1, 3 * j + 2):
                    a1, b1, c1 = pattern[k]
                    a2, b2, c2 = pattern[l]
                    if a1 > a2:
                        continue
                    if b1 > b2:
                        continue
                    x = dp[s][k] + c2
                    if dp[t][k] < x:
                        dp[t][k] = x

answer = max(itertools.chain(*dp))
print(answer)