import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353

n = ii()
g = [list() for i in range(n)]
for i in range(n - 1):
    a, b, c = mi()
    a, b = a - 1, b - 1
    g[a].append((b, c))
    g[b].append((a, c))

ans = 0
st = []
for j in range(30):
    used = [False] * n
    for i in range(n):
        if used[i]:
            continue
        st.append(i)
        used[i] = True
        cnt = 1
        while st:
            cur = st.pop()
            for to, weight in g[cur]:
                if not used[to] and weight >> j & 1:
                    st.append(to)
                    used[to] = True
                    cnt += 1
        ans += cnt * (cnt - 1) % mod * (1 << j) % mod
        ans %= mod
ans *= pow(2, mod - 2)
ans %= mod
print(ans)