import itertools

N, M = map(int, input().split())
score = [list(map(int, input().split())) for _ in range(M)]

A = list(itertools.permutations(list(range(N))))
B = [0]*len(A)

for i in range(M):
    K = score[i][0]
    L = score[i][1]
    T = score[i][2]
    for j in range(len(A)):
       if A[j].index(K) > A[j].index(L):
           B[j] += T

print(max(B))