#include <bits/stdc++.h>
#include <atcoder/modint>
#include <atcoder/dsu>
using namespace std;
using Modint = atcoder::modint1000000007;


int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vector<array<int, 3>> edge(N - 1);
    for(auto& [A, B, C] : edge){
        cin >> A >> B >> C;
        A--; B--;
    }
    Modint ans = 0;
    for(int i = 30; i--; ){
        ans += ans;
        atcoder::dsu uf(N);
        for(auto [A, B, C] : edge) if(C >> i & 1){
            ans += uf.size(A) * uf.size(B);
            uf.merge(A, B);
        }
    }
    cout << ans.val() << endl;
}