import sys
from collections import defaultdict

sys.setrecursionlimit(10 ** 6)

def main():
    def dfs(u, cnt=1, score=0):
        if cnt == n:
            return score
        res = 0
        for ku in range(n):
            if vis[ku]: continue
            vis[ku] = True
            ds = 0
            for pu, c in sc[ku]:
                if vis[pu]: ds += c
            res = max(res, dfs(ku, cnt + 1, score + ds))
            vis[ku] = False
        return res

    n, m = map(int,input().split())
    sc = defaultdict(list)
    for _ in range(m):
        u, v, c = map(int, input().split())
        sc[v].append([u, c])
    ans = 0
    for u in range(n):
        vis = [False] * n
        vis[u]=True
        ans = max(ans, dfs(u))
    print(ans)

main()