from atcoder.dsu import DSU
MOD = 10 ** 9 + 7
n = int(input())
g = [tuple(map(int, input().split())) for _ in range(n - 1)]
ans = 0
for i in range(0, 31):
	dsu = DSU(n)
	for a, b, c in g:
		if (c >> i) & 1:
			dsu.merge(a - 1, b - 1)
	for gr in dsu.groups():
		ans += (len(gr) * (len(gr) - 1) // 2 % MOD) * (1 << i) % MOD
		ans %= MOD
print(ans)