first_row = gets.split.map(&:to_i)
n = first_row[0]
m = first_row[1]

input = STDIN.read.split("\n")

Criteria = Struct.new(:item1, :item2, :score)

crt = []

input.each do |item|
  tmp = item.split.map!(&:to_i)
  str = Criteria.new(tmp[0], tmp[1], tmp[2])
  crt << str
end

ans = 0
(0..(n - 1)).to_a.permutation do |i|
  tmp = 0
  crt.each do |crt|
    if i.index(crt.item1) < i.index(crt.item2)
      tmp += crt.score
    end
    ans = [ans, tmp].max
  end
end

puts ans