class UnionFind:
    def __init__(self, n):
        self.par = [i for i in range(n+1)]
        self.rank = [0] * (n + 1)
        self.size = [1] * (n + 1)
 
    def find(self, x):
        if self.par[x] == x:
            return x
        else:
            self.par[x] = self.find(self.par[x])
            return self.par[x]

    def unite(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return
        if self.rank[x] < self.rank[y]:
            self.par[x] = y
            self.size[y] += self.size[x]
        else:
            self.par[y] = x
            self.size[x] += self.size[y]
            if self.rank[x] == self.rank[y]:
                self.rank[x] += 1
 
    def same_check(self, x, y):
        return self.find(x) == self.find(y)

n = int(input())
uf = [UnionFind(n) for _ in range(32)]
for i in range(n - 1):
    a, b, c = map(int, input().split())
    for j in range(32):
        if (c >> j) & 1:
            uf[j].unite(a - 1, b - 1)
ans = 0
for i, u in enumerate(uf):
    d = [0] * n
    for j in range(n):
        j = u.find(j)
        if d[j]:
            continue
        d[j] = 1
        s = u.size[j]
        ans += (s * (s - 1) // 2) << i
print(ans % (10 ** 9 + 7))