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

using ll = long long;

ll dfs(int N, vector<int> &a, vector<int> &b,vector<int> &c, int &d, ll &P) {
    
    ll res = 0;
    deque<int> que;
    vector<bool> visited(N);
    vector<vector<int>> edge(N,vector<int>());
    for( int i = 0; i < N-1; i++ ) {
        if( (c[i]>>d)&1 ) {
            edge[a[i]].push_back(b[i]);
            edge[b[i]].push_back(a[i]);
        }
    }
    
    for( int i = 0; i < N; i++ ) {
        if( visited[i] ) continue;
        que.push_back(i);
        ll cnt = 0;
        while( !que.empty() ) {
            int now = que.front();
            que.pop_front();
            if( visited[now] ) continue;
            visited[now] = true;
            cnt++;
            for( auto& next : edge[now] ) {
                if( !visited[next] ) que.push_back(next);
            }
        }
        res += cnt*(cnt-1)/2%P;
        res %= P;
    }
    
    return res;
    
}

void solve() {
    
    int N;
    cin >> N;
    vector<int> a(N-1);
    vector<int> b(N-1);
    vector<int> c(N-1);
    ll ans = 0;
    ll pt = 1;
    ll P = 1000000007;
    
    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++, pt*=2 ) {
        ans += dfs(N,a,b,c,i,P)*pt%P;
        ans %= P;
    }
    
    cout << ans << endl;
    
}

int main() {
    
    int t = 1;
    while( t > 0 ) {
        solve();
        t--;
    }
    
}