#include <bits/stdc++.h>
using namespace std;
#define rep(i, x, limit) for (long long i = (long long)x; i < (long long)limit; i++)
#define REP(i, x, limit) for (long long i = (long long)x; i <= (long long)limit; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el '\n'
#define spa " "
#define Yes cout << "Yes" << el
#define No cout << "No" << el
#define YES cout << "YES" << el
#define NO cout << "NO" << el
#define eps (1e-10)
#define Equals(a,b) (fabs((a) - (b)) < eps )
#define debug(x) cerr << #x << " = " << x << el
using ll = long long;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vs = vector<string>;
using vb = vector<bool>;
const double pi = 3.141592653589793238;
const int inf = 1073741823;
const ll infl = 1LL << 60;
const string ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string abc = "abcdefghijklmnopqrstuvwxyz";
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using vm = vector<mint>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll n;cin>>n;
  vector<vector<pll>> G(n);
  rep(i,0,n-1){
    ll u,v,w;cin>>u>>v>>w;
    u--;v--;
    G[u].push_back({v,w});
    G[v].push_back({u,w});
  }
  vb visited(n,false);
  ll ans=0;
  auto dfs=[&](auto&&f,ll now)->ll{
    visited[now]=true;
    ll stc=-infl;
    for(auto [to,w]:G[now]){
      if(visited[to])continue;
      ll res=f(f,to);
      ans=max(ans,res+w);
      ans=max(ans,stc+res+w);
      stc=max(stc,res+w);
    }
    return max(0LL,stc);
  };
  dfs(dfs,0);
  cout<<ans<<el;
}