#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

constexpr ll mod = 1e9+7;

struct UnionFind{
    vector<int> par,num;
    UnionFind(int n):par(n),num(n,1){
        iota(par.begin(),par.end(),0);  //include<numeric>
    }
    int find(int v){
        return (par[v]==v)?v:(par[v]=find(par[v]));
    }
    void unite(int u,int v){
        u=find(u),v=find(v);
        if(u==v)return;
        if(num[u]<num[v])swap(u,v);
        num[u]+=num[v];
        par[v]=u;
    }
    bool same(int u,int v){
        return find(u) == find(v);
    }
    int size(int v){
        return num[find(v)];
    }
};


int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n; cin >> n;
    ll res = 0;
    vector<int> x(n-1),y(n-1),c(n-1);
    for(int i=0;i+1<n;i++){
        cin >> x[i] >> y[i] >> c[i];
        x[i]--; y[i]--;
    }
    for(int i=0;i<30;i++){
        UnionFind uf(n);
        for(int j=0;j+1<n;j++){
            if((1<<i)&c[j]){
                uf.unite(x[j],y[j]);
            }
        }
        ll ad = 0;
        for(int j=0;j<n;j++){
            if(uf.find(j) == j){
                ad += (ll)(uf.size(j)) * (ll)(uf.size(j)-1) / 2;
            }
        }
        res += ad%mod*(1LL<<i)%mod;
    }
    cout << res%mod << endl;
}