from collections import defaultdict

n, m = map(int, input().split())
to = defaultdict(list)
ds = [[-1] * n for _ in range(n)]
dp = [[0] * (n) for _ in range(2 ** n)]
for _ in range(m):
    a, b, c = map(int, input().split())
    a -= 1
    b -= 1
    to[a].append(b)
    to[b].append(a)
    ds[a][b] = ds[b][a] = max(ds[a][b], c)
for s in range(1, 2 ** n):
    for cur in range(n):
        if s >> cur & 1 == 0: continue
        dp[s][cur] = max(dp[s][cur],max(dp[s - (1 << cur)][pre] + ds[cur][pre] for pre in to[cur] if (s >> pre) & 1))
print(max(dp[-1]))