package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	sc.Split(bufio.ScanWords)
	n, m := uint(nextInt()), nextInt()
	table := make([][]int, n)
	for i := range table {
		table[i] = make([]int, n)
	}

	for i := 0; i < m; i++ {
		table[nextInt()][nextInt()] = nextInt()
	}

	dp := make([]int, 1<<n)

	for i := 0; i < 1<<n; i++ {
		for j := uint(0); j < n; j++ {
			if i&(1<<j) != 0 {
				continue
			}
			nextI := i | 1<<j
			score := dp[i]

			for k := uint(0); k < n; k++ {
				if i&(1<<k) == 0 {
					continue
				}
				score += table[k][j]
			}
			if score > dp[nextI] {
				dp[nextI] = score
			}
		}
	}
	fmt.Println(dp[1<<n-1])
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextInt64() int64 {
	i, _ := strconv.ParseInt(nextLine(), 10, 64)
	return i
}

func nextUint64() uint64 {
	i, _ := strconv.ParseUint(nextLine(), 10, 64)
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}