program main
    use,intrinsic :: iso_fortran_env
    implicit none
    integer(int32)n,m,n2,s,ns,i,j
    integer(int32):: i1,i2,sc
    integer(int32), allocatable:: score(:,:),dp(:)

    read*, n,m
    allocate(score(n,n), source=0)
    do i=1,m
        read*, i1,i2,sc
        score(i1+1,i2+1) = sc
    end do
    n2 = lshift(1,n)-1
    allocate(dp(0:n2),source=0)

    do s=0,n2
        do i=1,n
            if (btest(s,i-1)) cycle
            ns = ibset(s,i-1)
            sc=sum([(merge(score(i,j),0,btest(s,j-1)),j=1,n)])
            dp(ns) = max(dp(ns), dp(s)+sc)
        end do
    end do
    print'(i0)', dp(n2)
end program main