# -*- coding: utf-8 -*-
# python template for atcoder1
import sys
sys.setrecursionlimit(10**9)
input = sys.stdin.readline

N, M = map(int, input().split())
items = [list(map(int, input().split())) for _ in range(M)]

# bitDP dp= max val of score
dp = [0]*(1 << N)

# すでに選んだ品物の集合
for mask in range(1 << N):
    for new_item in range(N):
        if mask >> new_item & 1 == 1:
            # すでに選ばれている
            continue

        for y, _, score in items:
            tmp_add = 0
            if mask >> y & 1 == 1:
                tmp_add += score
        new_state = mask | 1 << new_item

        dp[new_state] = max(dp[new_state], dp[mask]+tmp_add)
print(dp[-1])