import java.math.*;
import java.util.*;
 
public class Main {
	static int[] i1;
	static int[] i2;
	static int[] ten;
	static int ans=0;
	static int r;
	static int g;
	static void check(String now,ArrayList<Integer> ww){
		if(now.length()==r){
			eee(now);
			return;
		}
		for(int i=0;i<ww.size();i++){
			String ttt=new String(now);
			ttt+=ww.get(i);
			int eee=ww.get(i);
			ww.remove(i);
			check(ttt,ww);
			ww.add(i, eee);
		}
	}
	static void eee(String now){
		int temp=0;
		for(int i=0;i<g;i++){
			if(now.indexOf(i1[i]+"")<now.indexOf(i2[i]+"") ) temp+=ten[i];
		}
		ans=Math.max(ans, temp);
	}
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        r = sc.nextInt();
        g = sc.nextInt();
        ArrayList<Integer> uuu= new ArrayList<>();
        i1 = new int[g];
        i2=new int[g];
        ten = new int[g];
        for(int i=0;i<g;i++){
        	i1[i]=sc.nextInt();
        	i2[i]=sc.nextInt();
        	ten[i]=sc.nextInt();
        }
        for(int i=0;i<r;i++){
        	uuu.add(i);
        }
        check("",uuu);
        System.out.println(ans);
    }
}