def read_data():
    N, M = map(int, input().split())
    scores = [[0] * N for n in range(N)]
    for m in range(M):
        a, b, c = map(int, input().split())
        scores[a][b] = c
    return N, scores


def solve(N, scores):
    dp = [0] * (1 << N)
    for i in range(1, 1 << N):
        dp[i] = find_max(i, dp, scores, N)
    return dp[-1]

def find_max(used, dp, scores, N):
    record = 0
    for j in range(N):
        if used & (1<<j):
            score = dp[used - (1 << j)]
            sj = scores[j]
            score += sum(sj[b] for b in range(N) if not used & (1<<b))
            if score > record:
                record = score
    return record

N, scores = read_data()
print(solve(N, scores))