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, m)
	for i := 0; i < m; i++ {
		items[i].l = getNextInt(scanner)
		items[i].r = getNextInt(scanner)
		items[i].score = getNextInt(scanner)
	}
	var ans int
	dfs(0, n, make([]int, n), 0, items, &ans)
	fmt.Fprintln(writer, ans)
}

type item struct {
	l, r, score int
}

func dfs(i, n int, a []int, used uint32, items []item, ans *int) {
	if i == n {
		m := len(items)
		score := 0
		var ll uint32
		for j := 0; j < n; j++ {
			for k := 0; k < m; k++ {
				if items[k].r != a[j] {
					continue
				}
				if ll>>uint(items[k].l)&1 == 0 {
					continue
				}
				score += items[k].score
			}
			ll = ll | 1<<uint(a[j])
		}
		if *ans < score {
			*ans = score
		}
	}
	for j := 0; j < n; j++ {
		if used>>uint(j)&1 == 1 {
			continue
		}
		a[i] = j
		dfs(i+1, n, a, used|1<<uint(j), items, ans)
	}
}