class Yukicoder
  def initialize
    @n, @m = gets.chomp.split.map(&:to_i)
    @arr = Array.new(@n) { Array.new(@n, 0) }
    @m.times do
      a, b, c = gets.chomp.split.map(&:to_i)
      @arr[a][b] = c
    end
  end

  def run
    # 最大値
    max = 0    

    # 0〜@n-1で作る列の組み合わせを作成するO(n!)
    (0...@n).to_a.permutation(@n).each do |a|
      arr_cp = Marshal.load(Marshal.dump(@arr))
      sum = 0
      a.each do |i|
        sum += arr_cp[i].inject(:+)
        @n.times { |j| arr_cp[j][i] = 0 }
      end
      max = [sum, max].max
    end
    max
  end
end

puts Yukicoder.new.run