#!/usr/bin/env python3.8
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, M = map(int, readline().split())
m = map(int, read().split())
ABC = zip(m, m, m)

# %%
INF = 10 ** 9
dist = [[-INF] * N for _ in range(N)]
for a, b, c in ABC:
    a -= 1
    b -= 1
    if dist[a][b] < c:
        dist[a][b] = c
        dist[b][a] = c

# %%
dp = [[-INF] * (1 << N) for _ in range(N)]
for i in range(N):
    dp[i][1 << i] = 0
for n in range(1 << N):
    for j in range(N):
        if n & (1 << j):
            continue
        m = n | (1 << j)
        x = dp[j][m]
        for i in range(N):
            y = dp[i][n] + dist[i][j]
            if x < y:
                x = y
        dp[j][m] = x

# %%
answer = 0
for i in range(N):
    x = max(dp[i])
    if answer < x:
        answer = x
print(answer)