import java.util.*;
import java.io.*;

public class Main {
    static HashMap<Integer, Integer>[] maps;
    static int n;
    static int[] dp;
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] first = br.readLine().split(" ", 2);
        n = Integer.parseInt(first[0]);
        int m = Integer.parseInt(first[1]);
        maps = new HashMap[n];
        for (int i = 0; i < n; i++) {
            maps[i] = new HashMap<>();
        }
        for (int i = 0; i < m; i++) {
            String[] line = br.readLine().split(" ", 3);
            int a = Integer.parseInt(line[0]);
            int b = Integer.parseInt(line[1]);
            int score = Integer.parseInt(line[2]);
            maps[b].put(a, score);
        }
        dp = new int[1 << n];
        Arrays.fill(dp, -1);
        System.out.println(dfw((1 << n) - 1));
    }
    
    static int dfw(int key) {
        if (key == 0) {
            return 0;
        }
        if (dp[key] != -1) {
            return dp[key];
        }
        int max = 0;
        for (int i = 0; i < n; i++) {
            if (((1 << i) & key) == 0) {
                continue;
            }
            int score = 0;
            for (Map.Entry<Integer, Integer> entry : maps[i].entrySet()) {
                int x = entry.getKey();
                if (((1 << x) & key) != 0) {
                    score += entry.getValue();
                }
            }
            score += dfw(key ^ (1 << i));
            max = Math.max(max, score);
        }
        dp[key] = max;
        return max;
    }
}