#include <bits/stdc++.h>
using namespace std;
#define int long long
int ans = 0;
vector<int> cost;
vector<int> calculated;
vector<vector<pair<int, int>>> g;
int dfs(int u, int depth, int flag) {
if(depth >= 2) {
return 0;
}
if(depth == 1) {
for(auto v : g[u]) {
if(calculated[v.first] == flag) {
//cout << v.first << ' ' << u << '\n';
//cout << cost[v.first] << ' ' << cost[u] << ' ' << v.second << '\n';
ans = max(ans, cost[v.first] + cost[u] + v.second);
}
}
return 0;
}
int curr = 0;
for(auto v : g[u]) {
cost[v.first] = v.second;
calculated[v.first] = flag;
curr += v.second;
dfs(v.first, depth + 1, flag);
}
return curr;
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, m;
cin >> n >> m;
cost = vector<int>(n);
calculated = vector<int>(n, -1);
g = vector<vector<pair<int, int>>>(n);
for(int i = 0; i < m; i++) {
int from, to, w;
cin >> from >> to >> w;
from--;
to--;
g[from].push_back(make_pair(to, w));
g[to].push_back(make_pair(from, w));
}
ans = 0;
for(int i = 0; i < n; i++) {
int curr = dfs(i, 0, i + 1);
ans = max(ans, curr);
}
cout << ans << '\n';
return 0;
}
