#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
#include <atcoder/dsu>
using namespace std;


using i64 = long long;
using u64 = unsigned long long;
using i32 = int;
using u32 = unsigned int;
#define rep(i,n) for(int i=0; i<(int)(n); i++)


using modint = atcoder::static_modint<1'000'000'007>;


int main() {
    int N; cin >> N;
    vector<pair<pair<int,int>, int>> E(N-1);
    rep(i,N-1){
        int u,v,c; cin >> u >> v >> c; u--; v--;
        E[i] = {{u,v},c};
    }

    modint ans = 0;
    rep(d,30){
        atcoder::dsu dsu(N);
        for(auto [e,c] : E) if((c>>d) & 1) dsu.merge(e.first, e.second);
        modint tmp = 0;
        rep(i,N) tmp += (dsu.size(i) - 1);
        ans += tmp * (1<<d) / 2;
    }
    cout << ans.val() << endl;
    return 0;
}




struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;