#include <bits/stdc++.h>
#include <atcoder/dsu>
#include <atcoder/modint>
using namespace std;
using Mint = atcoder::modint1000000007;
int main()
{
    int N;
    cin >> N;
    vector<tuple<int, int, int>> V(N - 1);

    for (auto &[a, b, c] : V)
        cin >> a >> b >> c;

    Mint ret = 0;

    for (int i = 0; i < 30; i++)
    {
        atcoder::dsu DSU(N);
        for (auto [a, b, c] : V)
            if (c & (1 << i))
                DSU.merge(a - 1, b - 1);
        Mint ans = 0;
        for (int i = 0; i < N; i++)
            if (i == DSU.leader(i))
                ans += Mint(DSU.size(i)) * Mint(DSU.size(i) - 1) / Mint(2);
        ret += ans * Mint(1 << i);
    }
    cout << ret.val() << endl;
}