N, M = map(int, input().split())
g = [[-1]*N for _ in range(N)]
for i in range(M):
    a, b, c = map(int, input().split())
    a -= 1
    b -= 1
    g[a][b] = max(g[a][b], c)
    g[b][a] = max(g[b][a], c)

ans = 0
# 集合 i は訪問済みで最後に訪れたのが j の最大値
dp = [[-1]*N for _ in range(1 << N)]
for i in range(N):
    dp[1 << i][i] = 0

ans = 0
for i in range(1 << N):
    for j in range(N):
        if dp[i][j] == -1:
            continue
        for k in range(N):
            if (i >> k) & 1:
                continue
            if g[j][k] == -1:
                continue
            dp[i | (1 << k)][k] = max(dp[i | (1 << k)][k], dp[i][j] + g[j][k])
            ans = max(ans, dp[i | (1 << k)][k])

print(ans)