import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

n, m = map(int, input().split())
g = [[] for i in range(n)]
for i in range(m):
    a, b, c = map(int, input().split())
    a, b =a-1, b-1
    g[a].append((c, b))
    g[b].append((c,a))

dp = [[-1]*n for i in range(1<<n)]
for i in range(n):
    dp[1<<i][i] = 0
for s in range(1<<n):
    for v in range(n):
        if not ((s>>v)&1):
            continue
        for c, u in g[v]:
            if (s>>u)&1:
                continue
            ns = s|(1<<u)
            dp[ns][u] = max(dp[ns][u], dp[s][v]+c)
ans = 0
for s in range(1<<n):
    for v in range(n):
        ans = max(ans, dp[s][v])
print(ans)