n, m = [int(s) for s in input().split()]
table = [[0 for _ in range(n)] for _ in range(n)]

for i in range(m):
    item1, item2, score = map(int, input().split())
    table[item1][item2] = score

print(table)

dp = [0] * (1 << n)

for x in range(0, 1 << n):
    for i in range(n):
        if x & (1 << i):
            continue

        score = dp[x]
        for j in range(n):
            if x & (1 << j):
                score += table[j][i]

        v = x | (1 << i)
        if dp[v] < score:
            dp[v] = score

print(dp[(1 << n) - 1])