import sys
input = sys.stdin.readline

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

LLIST=[[-1]*(N+1) for i in range(N+1)]

for x,y,z in L:
    LLIST[x][y]=z
    LLIST[y][x]=z
    
from functools import lru_cache
@lru_cache(maxsize=None)
def calc(USED,LAST,DIS):
    #print(bin(USED),LAST,DIS)
    ANS=DIS
    for i in range(1,N+1):
        if USED & (1<<i) !=0:
            continue
        if LLIST[LAST][i]==-1:
            continue

        USED2=USED+(1<<i)


        ANS=max(ANS,calc(USED2,i,DIS+LLIST[LAST][i]))

    return ANS

ANS=0
for i in range(1,N+1):
    ANS=max(ANS,calc(1<<i,i,0))

print(ANS)