import itertools
N,M = map(int, raw_input().split())
scores = [[0 for i in range(N)] for j in range(N)]
for i in range(M):
    a,b,c = map(int, raw_input().split())
    scores[a][b] = c

base = range(0, N)
ans = 0
for perm in itertools.permutations(base):
    tmp = 0
    for i in range(N):
        for j in range(i + 1, N):
            tmp += scores[perm[i]][perm[j]]
    
    ans = max(ans, tmp)
    
print ans