import java.util.*;


public class Main_yukicoder357 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int m = sc.nextInt();

        List<List<Pair>> prev = new ArrayList<>();
        for (int i = 0; i < n; i++) {
        	prev.add(new ArrayList<>());
        }

        for (int i = 0; i < m; i++) {
        	int item1 = sc.nextInt();
        	int item2 = sc.nextInt();
        	int score = sc.nextInt();
        	prev.get(item2).add(new Pair(item1, score));

        }

        int[] dp = new int[0x1 << n];
        for (int i = 0; i < 0x1 << n; i++) {
        	for (int j = 0; j < n; j++) {
        		if ((i & 0x1 << j) != 0) {
        			continue;
        		}

        		int sum = 0;
        		for (Pair e : prev.get(j)) {
        			if ((i & 0x1 << e.a) != 0) {
        				sum += e.b;
        			}
        		}

        		dp[i | 0x1 << j] = Math.max(dp[i | 0x1 << j], dp[i] + sum);
        	}
        }

        System.out.println(dp[(0x1 << n) - 1]);

        sc.close();
    }

    private static class Pair {
    	int a;
    	int b;

    	Pair(int a, int b) {
    		this.a = a;
    		this.b = b;
    	}
    }
}