#!/usr/bin/python
# -*- coding: utf-8 -*-

# import
from sys import stdin, setrecursionlimit
setrecursionlimit(10**8)

def int_map():
    return map(int,input().split())

def int_list():
    return list(map(int,input().split()))

def int_mtx(N):
    x = [list(map(int, stdin.readline().split())) for _ in range(N)]
    return x

def str_mtx(N):
    x = [list(stdin.readline()[:-1]) for _ in range(N)]
    return x

def print_space(l):
    return print(" ".join([str(x) for x in l]))



"""    main code    """

N,M = int_map()

G = [[] for _ in range(N)]

for _ in range(M):
    i,j,c = int_map()
    G[j].append([i,c])

dp = [0 for _ in range(2**N)]

for s in range(2**N):
    for j in range(N):
        if s >> j & 1 == 0:
            cst = 0
            for i,c in G[j]:
                if s >> i & 1 == 1:
                    cst += c                
            dp[s+2**j] = max(dp[s+2**j], dp[s]+cst)

print(dp[2**N-1])