//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
using namespace std;

#define endl '\n'
#define lfs cout<<fixed<<setprecision(10)
#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()
#define spa << " " <<
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = (n); i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = (ll)(m) - 1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD1 = 1e9+7;
const ll MOD9 = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T1, typename T2>
bool chmin(T1 &a,T2 b){if(a>b){a=b;return true;}else return false;}
template<typename T1, typename T2>
bool chmax(T1 &a,T2 b){if(a<b){a=b;return true;}else return false;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>
void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}  
template<typename T>
void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>&v,ll h,ll w){for(ll i=0;i<h;i++)
{for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>
void debug(vector<T>&v,ll n){if(n!=0)cout<<v[0];
for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>
vector<vector<T>>vec(ll x, ll y, T w){
  vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
vector<ll>dx={1,0,-1,0,1,1,-1,-1};
vector<ll>dy={0,1,0,-1,1,-1,1,-1};
template<typename T>
vector<T> make_v(size_t a,T b){return vector<T>(a,b);}
template<typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v(ts...))>(a,make_v(ts...));
}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2>&p){
  return os << p.first << " " << p.second;
}  
struct edge{
  ll to=-1,cost=0;
  edge(){};
  edge(ll t,ll c):to(t),cost(c){};
};
struct CentroidDecomposition{
	ll n;
	const vector<vector<edge>> &g;
	vector<bool> used;//既に重心として選ばれたか
	vector<ll> sub;//部分木のサイズ
	CentroidDecomposition(const vector<vector<edge>> &g):g(g){
		n = g.size();
		sub.assign(g.size(), 0);
		used.assign(g.size(), false);
	}
	ll search_centroid(ll root){
		return dfs_search(root, -1, dfs_sz(root, -1) / 2 );
	}
	ll dfs_sz(ll k, ll par){
		sub[k] = 1;
		for(auto e:g[k]){
			if(e.to == par || used[e.to])continue;
			sub[k] += dfs_sz(e.to, k);
		}
		return sub[k];
	}
	ll dfs_search(ll k, ll par, ll mid){
		for(auto e:g[k]){
			if(e.to == par || used[e.to])continue;
			if(sub[e.to] > mid)return dfs_search(e.to, k, mid);
		}
		return k;
	}
  vector<ll> centroid_enum(ll root){
    vector<ll>ret;
    ret.push_back(search_centroid(root));
    for(auto e:g[ret[0]]){
      if(used[e.to] || n != 2 * sub[e.to])continue;
      ll c = search_centroid(e.to);
      if(c != ret[0]){
        ret.push_back(c);
        break;
      }
    }
    return ret;
  }
	void run(){
		//何か前処理を書くなら

		solve(0);
	}

	void solve(ll root){
		ll cent = search_centroid(root);
		ll size = sub[root];
		used[cent] = true;
		vector<vector<ll>>ver;
		for(auto e:g[cent]){
			if(!used[e.to]){
				ver.emplace_back();
				dfs(e.to,-1,ver.back());
			}
		}

		for(auto e:g[cent]){
			if(!used[e.to]){
				solve(e.to);
			}
		}
		used[cent] = false;

		return; //統治するなら何か返す
	}
	void dfs(ll k,ll par,vector<ll>&ver){
		ver.push_back(k);
		for(auto e:g[k]){
			if(e.to==par||used[e.to])continue;
			dfs(e.to,k,ver);
		}
	}
};
ll ret=0;
void dfs(ll k,vector<vector<edge>>&g,ll par,ll d){
  ret+=2*d;
  for(auto e:g[k]){
    if(par!=e.to){
      dfs(e.to,g,k,d+e.cost); 
    }
  }
}
int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res=0,buf=0;
  bool judge = true;
  ll n;cin>>n;
  vector<vector<edge>>g(n);
  rep(i,0,n-1){
    ll a,b,c;cin>>a>>b>>c;a--;b--;
    g[a].EB(b,c);
    g[b].EB(a,c);
  }
  CentroidDecomposition cent(g);
  auto r=cent.centroid_enum(0);
  dfs(r[0],g,-1,0);
  if(r.size()==2){
    for(auto e:g[r[0]]){
      if(e.to==r[1])ret-=e.cost;
    }
  }
  else{
    ll mi=INF;
    for(auto e:g[r[0]]){
      chmin(mi,e.cost);
    }
    ret-=mi;
  }
  //debug(r,r.size());
  cout<<ret<<endl;
  return 0;
}

Measured memory_bytes: 11776