#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
using namespace std;
typedef long long LL;
const LL INF = 0x3f3f3f3f3f3f3f3f;

LL ec = 0,hed[200005] = {0},to[400005],w[400005],nxt[400005];
void add_edge(LL f,LL t,LL cst){
	++ ec; to[ec] = t; nxt[ec] = hed[f]; w[ec] = cst; hed[f] = ec;
}

LL siz[200005],mx[200005];
LL ans = 0,n;

void dfs(LL u,LL f){
	siz[u] = 1;
	for(LL i = hed[u];i;i = nxt[i]){
		LL v = to[i];
		if(v == f) continue;
		dfs(v,u);
		siz[u] += siz[v]; mx[u] = max(mx[u],siz[v]);
		ans += 2 * min(siz[v],n - siz[v]) * w[i];
	}
	mx[u] = max(mx[u],n - siz[u]);
}

int main(){
	ios::sync_with_stdio(false);
	LL u,v,ww,g = INF,sub = INF,p1 = 0,p2 = 0;
	cin >> n;
	for(LL i = 1;i < n;i ++){
		cin >> u >>	v >> ww;
		add_edge(u,v,ww);
		add_edge(v,u,ww);
	}
	dfs(1,0);
	for(LL i = 1;i <= n;i ++) g = min(g,mx[i]);
	for(LL i = 1;i <= n;i ++){
		if(mx[i] != g) continue;
		if(!p1) p1 = i;
		else p2 = i;
	}
	for(LL i = hed[p1];i;i = nxt[i]){
		LL v = to[i];
		if(p2 && v != p2) continue;
		sub = min(sub,w[i]);
	}
	cout << ans - sub << endl;
	return 0;
}