from itertools import permutations

n,m = list(map(int, input().split(' ')))        

scores = []
for i in range(n):
    r = [0] * n
    scores.append(r)

for i in range(m):
    left, right, score = list(map(int, input().split(' ')))
    scores[left][right] = score

ms = -1    
for p in permutations(range(n)):
    score = 0
    for i in range(n-1):
        for j in range(i+1,n):
            score += scores[p[i]][p[j]]
            ms = max(ms, score)
print(ms)