def max(a,b); a > b ? a : b; end

N, M = gets.split.map(&:to_i)
S = Array.new(N){ Array.new(N, 0) } 
M.times do
  t1, t2, score = gets.split.map(&:to_i)
  S[t1][t2] = score
end

dp = Array.new(1 << N, 0)
(1 << N).times do |s|
  used = N.times.select{|i| s[i] > 0 }
  used.each do |i|
    up = used.map{|j| S[j][i] }.sum
    dp[s] = max(dp[s],dp[s ^ (1 << i)] + up)
  end
end
puts dp[-1]