import sys
import itertools
N, M = map(int,input().split())
listN = [i for i in range(N)]
scores = [[] for _ in range(M)]
for i in range(M):
    a,b,sc = map(int,input().split())
    scores[i] = [a,b,sc]
scores.sort()
ans = 0
for t in itertools.permutations(listN):
    score = 0
    for i in range(N-1):
        for s in scores:
            if t[i] == s[0] and t[i+1] == s[1]:
                    score += s[2]
                    break
            elif s[0] > t[i]:
                break
    ans = max(ans,score)
print(ans)