def narabe(N):
    if N == 2:
        result = [[0, 1], [1, 0]]
        return result
    result = []
    bef_f = narabe(N - 1)
    for i in range(len(bef_f)):
        li1 = bef_f[i]
        for j in range(len(li1) + 1):
            li2 = [] + li1
            li2.insert(j, N - 1)
            result.append(li2)
    return result

def shinamono(N, M, scores):
    lists = narabe(N)
    score_list = []
    for i in range(len(lists)):
        score = 0
        li = lists[i]
        for j in range(M):
            a = li.index(scores[j][0])
            b = li.index(scores[j][1])
            if a < b:
                score += scores[j][2]
        score_list.append(score)
    result = max(score_list)
    return result

def main():
    N, M = map(int, input().split())
    scores = [[0, 0, 0] for i in range(M)]
    for j in range(M):
        scores[j][0], scores[j][1], scores[j][2] = map(int, input().split())
    print(shinamono(N, M, scores))

if __name__ == '__main__':
    main()