N,M = map(int,input().split())
scores = [[0]*N for _ in range(N)]
for _ in range(M):
    i,j,score = map(int,input().split())
    scores[i][j] = score

dp = [[0]*N for _ in range(1<<N)]

for s in range(1<<N):
    # 次に選ぶ商品
    for i in range(N):
        if s&(1<<i):
            continue
        # iを選んだときに既に選んだ商品から得られるスコア
        score = 0
        for j in range(N):
            if s&(1<<j):
                score += scores[j][i]
        for j in range(N):
            dp[s|(1<<i)][i] = max(dp[s|(1<<i)][i], dp[s][j]+score)

print(max(dp[(1<<N)-1]))