import copy

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

x={}
for i in range(M):
    temp1,temp2,temp3=tuple(map(int,input("").split(" ")))
    if temp2-1 not in x:
        x[temp2-1]=[]
    if temp1-1 not in x:
        x[temp1-1]=[]
    x[temp2-1].append([temp3,temp1-1])
    x[temp1-1].append([temp3,temp2-1])


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