#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

const ll modc = 1e9+7;

vector<bool> visit;
ll v;

void dfs(ll from, vector<vector<ll>> &E){
    ll cnt = 1;
    visit[from] = 1;
    v++;

    for (auto to : E[from]){
        if (visit[to]) continue;
        dfs(to, E);
    }
}

int main(){

    ll N, ans=0;
    cin >> N;
    visit.resize(N);
    vector<ll> A(N-1), B(N-1), C(N-1);
    for (int i=0; i<N-1; i++){
        cin >> A[i] >> B[i] >> C[i];
        A[i]--; B[i]--;
    }

    for (int i=0; i<30; i++){
        vector<vector<ll>> E(N);
        for (int j=0; j<N; j++) visit[j] = 0;
        for (int j=0; j<N-1; j++){
            if (C[j] & (1<<i)){
                E[A[j]].push_back(B[j]);
                E[B[j]].push_back(A[j]);
            }
        }
        for (int j=0; j<N; j++){
            v = 0;
            if (!visit[j]) dfs(j, E);
            ans += ((v * (v-1) / 2) * (1LL << i)) % modc;
            ans %= modc;
        }
    }
    cout << ans << endl;

    return 0;
}