import strutils


proc nextString: string =
  result = ""
  while not endOfFile stdin:
    let nextChar = readChar stdin
    case nextChar
    of '\r':
      discard
    of "\n"[0], ' ':
      break
    else:
      add result, nextChar


proc nextInt: int =
  parseInt nextString()


let
  n, m = nextInt()

var
  scoreList = newSeq[tuple[item1, item2, score: int]](m)
  ans = 0


proc calcScore(items: seq[int], x: int): int =
  for i in 0 ..< m:
    if x == scoreList[i].item2 and scoreList[i].item1 in items:
      result += scoreList[i].score


proc dfs(items: seq[int], score: int) =
  if items.len == n:
    ans = max(ans, score)
    return

  for i in 0 ..< n:
    if i notin items:
      dfs(items & i, score + calcScore(items, i))


proc main: void =
  for i in 0 ..< m:
    scoreList[i] = (nextInt(), nextInt(), nextInt())

  dfs(@[], 0)
  echo ans


when isMainModule:
  main()