import sys
sys.setrecursionlimit(1000010)
def input():
	return sys.stdin.buffer.readline()[:-1]
MOD = 10**9+7

n = int(input())
aff = [0 for _ in range(n)]
adj = [[] for _ in range(n)]
for _ in range(n-1):
	u, v = map(int, input().split())
	adj[u-1].append(v-1)
	aff[v-1] += 1
for i, x in enumerate(aff):
	if x == 0:
		root = i
		break

ans = 0
dep = [0 for _ in range(n)]
ans = 0
stack = [root]
while stack:
	i = stack.pop()
	ans += dep[i] * (dep[i]+1) // 2
	ans %= MOD
	for j in adj[i]:
		dep[j] = dep[i]+1
		stack.append(j)

print(ans)