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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        ArrayList<HashMap<Integer, Integer>> list = new ArrayList<>();
        int m = sc.nextInt();
        for (int i = 0; i < n; i++) {
            list.add(new HashMap<>());
        }
        for (int i = 0; i < m; i++) {
            int left = sc.nextInt();
            int right = sc.nextInt();
            int score = sc.nextInt();
            list.get(right).put(left, score);
        }
        int[] dp = new int[1 << n];
        for (int i = 1; i < (1 << n); i++) {
            for (int j = 0; j < n; j++) {
                if ((i & (1 <<j)) == 0) {
                    continue;
                }
                int prev = (i ^ (1 << j));
                int tmp = 0;
                for (int x : list.get(j).keySet()) {
                    if ((prev & (1 << x)) != 0) {
                        tmp += list.get(j).get(x);
                    }
                }
                dp[i] = Math.max(dp[i], dp[prev] + tmp);
            }
        }
        System.out.println(dp[(1 << n) - 1]);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String nextLine() throws Exception {
        return br.readLine();
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}