import itertools
N, M = map(int,input().split())
items = [[0 for i in range(N)] for j in range(N)]
for i in range(M):
  a,b,c = map(int,input().split())
  items[a][b] = c
dp = [-1] * (1<<N)
def rec(mask,dc):
  if mask >= ((1<<N)-1): return 0
  if dp[mask] != -1: return dp[mask]
  ret = 0
  for i in range(N):
    if mask & (1 << i): continue
    score = 0
    for j in range(N):
      if mask & (1 << j): score += items[i][j]
    chk = rec(mask | (1 << i),dc+1) + score
    if ret < chk: ret = chk
  dp[mask] = ret
  #print('{:0>3},{:0>3}'.format(mask,dc),format(mask,'b').zfill(N),ret)
  return ret
print(rec(0,1))