package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	m := getNextInt(scanner)
	items := make([][]item, n)
	for i := 0; i < m; i++ {
		l := getNextInt(scanner)
		r := getNextInt(scanner)
		score := getNextInt(scanner)
		items[r] = append(items[r], item{l: l, r: r, score: score})
	}
	nn := 1 << uint(n)
	dp := make([]int, nn)
	for i := 0; i < nn; i++ {
		for j := 0; j < n; j++ {
			if i>>uint(j)&1 == 0 {
				continue
			}
			score := dp[i^(1<<uint(j))]
			for _, it := range items[j] {
				if i>>uint(it.l)&1 == 0 {
					continue
				}
				score += it.score
			}
			if dp[i] < score {
				dp[i] = score
			}
		}
	}
	fmt.Fprintln(writer, dp[nn-1])
}

type item struct {
	l, r, score int
}