#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)

using std::cin;
using std::cout;
using std::vector;
using std::array;
using mint = modint1000000007;

int main() {
	int n;
	cin >> n;
	
	vector<array<int, 3>> es(n-1);
	for (auto& [a, b, c] : es) {
		cin >> a >> b >> c;
		--a; --b;
	}
	
	mint ans;
	rep(i, 30) {
		dsu t(n);
		for (auto& [a, b, c] : es) {
			if (c>>i&1) {
				t.merge(a, b);
			}
		}
		for (auto g : t.groups()) {
			mint x = g.size();
			x = x * (x-1) / 2;
			ans += x * (1<<i);
		}
	}
	
	cout << ans.val() << '\n';
	
	return 0;
}