import java.util.Scanner;

public class Main {
    static int N, M;
    static int list[][];
    static boolean flag[];
    static int ans = 0;
    
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            N = Integer.parseInt(scan.next());
            M = Integer.parseInt(scan.next());
            flag = new boolean[N];
            list = new int[N][N];
            for(int i=0; i<M; i++) {
                int y = Integer.parseInt(scan.next());
                int x = Integer.parseInt(scan.next());
                int v = Integer.parseInt(scan.next());
                list[y][x] = v;
            }
            pattern("");
            System.out.println(ans);
        }
    }
    
    static void pattern(String now) {
        if(now.length() == N) {
            int sum = 0;
            for(int i=0; i<N; i++) {
                for(int j=0; j<N; j++) {
                    if(list[i][j] > 0) {
                        int left = now.indexOf(""+i);
                        int right = now.indexOf(""+j);
                        if(left < right) {
                            sum += list[i][j];
                        }
                    }
                }
            }
            ans = Math.max(ans, sum);
            return;
        }
        
        for(int i=0; i<N; i++) {
            if(!flag[i]) {
                flag[i] = true;
                pattern(now + i);
                flag[i] = false;
            }
        }
    }
}