import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)
mod = 10 ** 9 + 7

N = int(input())
child = [[] for _ in range(N)]
deg = [0] * N
for _ in range(N - 1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    child[a].append(b)
    deg[b] += 1

for i, c in enumerate(deg):
    if not c:
        root = i
        break

dist = [0] * N
que = [root]
while que:
    s = que.pop()
    for t in child[s]:
        dist[t] = dist[s] + 1
        que.append(t)

ans = 0
for d in dist:
    ans += d * (d + 1) // 2
    ans %= mod

print(ans)