import itertools
import numpy as np

item1 = []
item2 = []

N, M = list(map(int, input().split()))

#score_book = [[0 for i in range(N)] for j in range(N)]
score_book = np.zeros([N, N])
score = np.zeros([M, 3])


for n in range(M):
    i, j, k = list(map(int, input().split()))
    score[n, 0] = i
    score[n, 1] = j
    score[n, 2] = k

#全てのパターンを網羅する。
#combi = list(itertools.permutations([i for i in range(N)], N))
combi = np.array(list(itertools.permutations([i for i in range(N)], N)))

#全通りのスコアを入れる配列を作る
#score_table = [0 for i in range(len(combi))]
combi_len = len(combi)
score_table = np.zeros([combi_len])

for i in range(combi_len): 
    for j in range(N - 1):
        for m in range(M):
            if combi[i][j] == score[m, 0]:
                #組み合わせの先頭で一致すれば、後ろはどの組み合わせでも問題ない
                if j == 0:
                    score_table[i] = score_table[i] + score[m, 2]
                    continue
                for k in range(j + 1, N):
                    if combi[i][k] == score[m, 1]:
                        score_table[i] = score_table[i] + score[m, 2]

print(int(max(score_table)))