import sys
from operator import itemgetter
readline = sys.stdin.readline

def compress(L):
    L2 = list(set(L))
    L2.sort()
    C = {v : k for k, v in enumerate(L2)}
    return L2, C


N = int(readline())
Box = []
LL = []
for i in range(N):
    a, b, c = map(int, readline().split())
    a, b, c = sorted([a, b, c])
    LL.extend([c, c, b])
    Box.append((i, 0, a, b, c))
    Box.append((i, 1, b, a, c))
    Box.append((i, 2, c, a, b))

Box.sort(key = itemgetter(3))
dp = [[0]*(3*N) for _ in range(1<<N)]
for i, ori, point, _, w in Box:
    dp2 = dp[:]
    look = []
    widx = 3*i+ori
    for j in range(3*N):
        if j != widx and LL[j] <= w:
            look.append(j)
    for S in range(1<<N):
        if not (1<<i) & S:
            continue
        T = S^(1<<i)
        res = 0
        for j in look:
            res = max(res, dp[T][j])
        dp[S][widx] = res + point
    
print(max(max(d) for d in dp))