from itertools import product
import sys
input=sys.stdin.readline

N,M=map(int,input().split())

inf=float("inf")
length=[[0 if i==j else -inf for j in range(N)] for i in range(N)]

for _ in range(M):
    a,b,c=map(int,input().split())
    length[a-1][b-1]=length[b-1][a-1]=max(length[a-1][b-1],c)

DP=[[-inf]*N for _ in range(1<<N)]
for v in range(N):
    DP[1<<v][v]=0

for S in range(1<<N):
    for v in range(N):
        if (S>>v)&1==0:
            continue

        for w in range(N):
            if (S>>w)&1==1:
                continue

            DP[S|(1<<w)][w]=max(DP[S|(1<<w)][w], DP[S][v]+length[v][w])

Ans=-inf
for S in range(1<<N):
    Ans=max(Ans, max(DP[S]))
print(Ans)