#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """5 4
# 1 2 3
# 3 2 3
# 2 4 3
# 4 5 2
# """
# sys.stdin = io.StringIO(_INPUT)


def main():
    N, M = map(int, input().split())
    G = [list() for _ in range(N)]
    for i in range(M):
        a, b, c = map(int, input().split())
        G[a-1].append((b-1, c))
        G[b-1].append((a-1, c))

    dp = [[10**10] * N for _ in range(1<<N)]
    ans = 0
    for i in range(N):
        dp[1<<i][i] = 0
    for s in range(1<<N):
        for i in range(N):
            if dp[s][i] == 10**10 or not(s & (1<<i)):
                continue
            for j, cost in G[i]:
                if s & (1<<j):
                    continue
                s1 = s | (1<<j)
                dp[s1][j] = min(dp[s1][j], dp[s][i] + cost)
                ans = max(ans, dp[s1][j])

    print(ans)

if __name__ == '__main__':
    main()