# coding: utf-8
from itertools import permutations
from itertools import combinations

N, M = map(int, input().split())
scores = [[0] * N for __ in range(N)]

for __ in range(M):
    i1, i2, sc = map(int, input().split())
    scores[i1][i2] = sc

max_score = 0
for per in permutations(range(N)):
    tmp_score = 0
    for i in range(N):
        for j in per[i:]:
            tmp_score += scores[i][j]
    max_score = max(max_score, tmp_score)

print(max_score)