#include <algorithm>
#include <cassert>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstring>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <vector>
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
//#define cerr if(false) cerr
#ifdef DEBUG
#define show(...) cerr << #__VA_ARGS__ << " = ", debug(__VA_ARGS__);
#else
#define show(...) 42
#endif
using namespace std;
using ll = long long;
using pii = pair<int, int>;
template <typename T, typename S>
ostream& operator<<(ostream& os, pair<T, S> a) {
    os << '(' << a.first << ',' << a.second << ')';
    return os;
}
template <typename T>
ostream& operator<<(ostream& os, vector<T> v) {
    for (auto x : v) os << x << ' ';
    return os;
}
void debug() {
    cerr << '\n';
}
template <typename H, typename... T>
void debug(H a, T... b) {
    cerr << a;
    if (sizeof...(b)) cerr << ", ";
    debug(b...);
}
int n;
ll ans;
vector<pii>g[200005];
ll dfs(int s, int p){
    ll res = 1;
    for(auto x :g[s]){
        if(x.first == p)continue;
        ll e = x.second;
        ll z = dfs(x.first, s);
        res += z;
        show(s, x.first,e, z);
        ans += e * z * (n - z);
    }
    return res;
}
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    rep(i,n-1){
        int a, b, c;
        cin >> a >> b >> c;
        a--,b--;
        g[a].emplace_back(b,c);
        g[b].emplace_back(a,c);
    }
    dfs(0,-1);
    cout << ans * 2 << endl;
}