inputs = STDIN.readlines.map(&:chomp)
N, M = inputs[0].split(/\s+/).map(&:to_i)
SCORES = inputs[1..-1].map { |line| line.split(/\s+/).map(&:to_i) }

class Calc
  def initialize
    @memos = Array.new(N) { Hash.new }
    @merchandises = (0...N).to_a
    @score_table = Hash.new { |h, k| h[k] = Hash.new }
    SCORES.each do |t|
      @score_table[t[0]][t[1]] = t[2]
    end
  end

  def run
    dp(0, nil, @merchandises)
  end

  def dp(score, last, rest)
    if rest.empty?
      res = 0
    elsif last && @memos[last][rest]
      res = @memos[last][rest]
    elsif last
      res = rest.map { |m|
        dp(@score_table[last][m].to_i, m, rest - [m])
      }.max
    else
      res = rest.map { |m|
        dp(0, m, rest - [m])
      }.max
    end
    @memos[last][rest] = res if last
    score + res
  end
end

puts Calc.new.run