import copy

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

x=[[-1 for j in range(N)] for i in range(N)]
for i in range(M):
    temp1,temp2,temp3=tuple(map(int,input("").split(" ")))
    temp1-=1
    temp2-=1
    x[temp1][temp2]=max([temp3,x[temp2][temp1]])
    x[temp2][temp1]=max([temp3,x[temp2][temp1]])


dp_s=[]

if True:
    dp=[[-1 for j in range(N)] for i in range(1<<N)]
    for i in range(N):
        dp[1<<i][i]=0
    A=-100000000000000000
    for i2 in range(0,1<<N):
        for i3 in range(N):
            if  dp[i2][i3]>=0:
                A=max([A,dp[i2][i3]])
                for j in range(N):
                    if x[i3][j]>=0 and not(i2&(1<<j)):
                        dp[i2|(1<<j)][j]=max([dp[i2][i3]+x[i3][j],dp[i2|(1<<j)][j]])
    print(A)