import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int m = sc.nextInt();
    int[][] score = new int[n][n];
    for(int i = 0; i < m; i++) {
      int i1 = sc.nextInt();
      int i2 = sc.nextInt();
      int s = sc.nextInt();
      score[i2][i1] = s;
    }
    int p = (int)Math.pow(2, n);
    int[] dp = new int[p];

    for(int i = 1; i < p; i++) {
      for(int j = 0; j < n; j++) {
        if((i & (1 << j)) != 0) {
          int i1 = i - (1 << j);
          int t = dp[i1];
          for(int k = 0; k < n; k++) {
            if((i1 & (1 << k)) != 0) {
              t += score[j][k];
            } 
          }
          dp[i] = Math.max(dp[i], t); 
        }
      }
    }
    System.out.println(dp[p - 1]);
  }
}