import algorithm, math, sequtils, strutils

let
  nm = stdin.readLine.split.map parseInt
  n = nm[0]
  m = nm[1]
  inputs = (0 ..< m).mapIt stdin.readLine.split.map parseInt
var
  g = n.succ.newSeqWith newSeq[(int, int)](succ n)
  
for v in inputs:
  g[v[0]].add (v[1], v[2])


proc fn(xs: seq[int]): int =
  result = 0
  var
    points = 0.repeat n.succ
  for x in xs:
    result += points[x]
    for (b, p) in g[x]:
      points[b] += p


var
  xs = (0 ..< n).toSeq
  maximum = fn xs

while nextPermutation xs:
  maximum = xs.fn.max maximum

echo maximum