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

def change(n,*args):
    b = list(args)
    c = list(args)
    if n < N:
        for i in range(N):
            if b[n] == -1 and i not in b:
                c[n] = i
                change(n+1,*c)
    else:
        score = 0
        for j in range(M):
            if b[items[j][0]] < b[items[j][1]]:
                score += items[j][2]
        global ss
        ss.append(score)
a = [-1]*N
change(0,*a)
print(max(ss))