using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicoder
{
	public class Program
	{
		public static void Main()
		{
			var n = Console.ReadLine().Split(' ').Select(value => int.Parse(value)).ToArray();
			var S = new int[n[1]][];
			for(var i= 0; i < n[1]; i++)
            {
				S[i] = Console.ReadLine().Split(' ').Select(value => int.Parse(value)).ToArray();
			}
            var A = AllPermutation(Enumerable.Range(0, n[0]).ToArray());
            var m = 0;
            foreach(var aa in A)
            {
                var a = String.Join("", aa);
                var k = 0;
                foreach(var s in S)
                {
                    if(a.IndexOf(s[0].ToString())< a.IndexOf(s[1].ToString()))
                    {
                        k += s[2];
                    }
                }
                m = Math.Max(m, k);
            }
            Console.WriteLine(m);
        }
        static List<T[]> AllPermutation<T>(params T[] array) where T : IComparable
        {
            var a = new List<T>(array).ToArray();
            var res = new List<T[]>();
            res.Add(new List<T>(a).ToArray());
            var n = a.Length;
            var next = true;
            while (next)
            {
                next = false;

                // 1
                int i;
                for (i = n - 2; i >= 0; i--)
                {
                    if (a[i].CompareTo(a[i + 1]) < 0) break;
                }
                // 2
                if (i < 0) break;

                // 3
                var j = n;
                do
                {
                    j--;
                } while (a[i].CompareTo(a[j]) > 0);

                if (a[i].CompareTo(a[j]) < 0)
                {
                    // 4
                    var tmp = a[i];
                    a[i] = a[j];
                    a[j] = tmp;
                    Array.Reverse(a, i + 1, n - i - 1);
                    res.Add(new List<T>(a).ToArray());
                    next = true;
                }
            }
            return res;
        }
    }
}