#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second
#define coy cout<<"YES\n"
#define con cout<<"NO\n"
#define co1 cout<<"-1\n"
#define sc(x) scanf("%lld",&x)
#define all(x) x.begin(),x.end()
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int SI=4e5+7;
ll INF=8e18+7;
int dx[] = {1 , -1 , 0 , 0};
int dy[] = {0 , 0 , 1 , -1};
int MOD=1e9+7;
ll n,m;
vector <pair <ll,ll> > v[SI];
map <pair < ll,ll>,ll > mp;
ll ans=0;
void dfs(int x,int st,int len,int sum)
{
if (len==2)
{
if (mp[{x,st}]==0)
return ;
ans=max(ans,sum+mp[{x,st}]);
return ;
}
for (auto i:v[st])
{
if (i.F!=st)
dfs(x,i.F,len+1,sum+i.S);
}
}
int main()
{
fast
cin>>n>>m;
for (int i=0;i<m;i++)
{
ll x,y,z;
cin>>x>>y>>z;
mp[{x,y}]=mp[{y,x}]=z;
v[x].pb({y,z});
v[y].pb({x,z});
}
for (int i=1;i<=n;i++)
{
ll sum=0;
for (auto e:v[i])
sum+=e.S;
ans=max(ans,sum);
dfs(i,i,0,0);
}
cout <<ans <<"\n";
// use scanf not cin
return 0;
}
