import itertools

n, m = map(int, input().split())

x = list(range(n))
y = list(itertools.permutations(x))
listA = []
listB = []
listC = []
listD = []
for i in range(1, m + 1):
    listA.append(list(map(int, input().split())))
    listE = listA[i - 1]
    listB.append(listE[0])
    listC.append(listE[1])
    listD.append(listE[2])
sum = 0

for z in y:
    list(z)
    temp = 0
    for w in range(0, m):
        if z.index(listB[w]) < z.index(listC[w]):
            temp += listD[w]
    sum = max(sum, temp)
print(sum)