program main
  implicit none
  integer*8::N,M
  integer*8::i,ii,jj,ss,maxscore
  integer*8,parameter::d = 9
  integer*8::score(d,d),items(d)
  data score/81*0/
  items = (/(i,i=1,d)/)
  read *,N,M

  do i=1,M
     read *,ii,jj,ss
     score(ii+1,jj+1) = ss
  end do
  maxscore = 0
  do
     maxscore = MAX(maxscore, get_scores(items, score, N))
     if(.not.(next_permutation(items, d))) exit
  end do
  print '(i0)', maxscore
contains
  function get_scores(items, score, d) result(total)
    integer*8::total,i,j,d
    integer*8,intent(in)::score(:,:), items(:)
    total = 0
    do i=1,d-1
       do j=i,d
          total = score(items(i), items(j)) + total
       end do
    end do
  end function get_scores
  function next_permutation(array, d) result(notlast)
    logical::notlast
    integer*8::array(:),d,i,j,k,swap

    do i=d,2,-1
       if(array(i-1).lt.array(i)) exit
    end do
    if(i.eq.1) then
       notlast = .false.
       return
    else
       notlast = .true.
    end if
    do j=d,i+1,-1
       if(array(i-1).lt.array(j)) exit
    end do
    swap       = array(i-1)
    array(i-1) = array(j)
    array(j)   = swap
    do k=0, (d-1-i)/2
       swap       = array(i+k)
       array(i+k) = array(d-k)
       array(d-k) = swap
    end do
  end function next_permutation
end program main