from itertools import permutations
N,M = map(int,input().split())
l = [[] for _ in range(N)]
ans = 0
for _ in range(M):
    i,y,s = map(int,input().split())
    l[i].append([y,s])
for perm in permutations(range(N)):
    perm = list(perm)
    now = 0
    for i in range(N):
        for item,score in l[i]:
            if item in perm[:i]:
                now += score
    ans = max(ans,now)
print(ans)