import sys
readline = sys.stdin.readline

N,M = map(int,readline().split())
C = [list(map(int,readline().split())) for i in range(M)]
cond = [[0] * N for i in range(N)]
for item1, item2, score in C:
  cond[item2][item1] = score

dp = [0] * (1 << N)
for status in range(1 << N):
  for target in range(N):
    if (status >> target) & 1:
      continue
    # 各条件に当てはまるか確認
    next_status = status | (1 << target)
    points = 0
    for i in range(N):
      if cond[target][i] == 0: # item1がiのとき得点得られない
        continue
      if (status >> i) & 1:
        points += cond[target][i]
    if dp[next_status] < dp[status] + points:
      dp[next_status] = dp[status] + points
      
print(dp[-1])