import sys
input=lambda: sys.stdin.readline().rstrip()

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

from collections import deque
TS = list(v for v in range(n) if deg[v]==0)
deq = deque(TS)
used = [0]*n

while deq:
  v = deq.popleft()
  for t in edge[v]:
    deg[t] -= 1
    if deg[t]==0:
      deq.append(t)
      TS.append(t)

L,R=[0]*n,[0]*n
for i in range(n):
  v=TS[i]
  for g in edge[v]:
    L[g]+=L[v]+1

for i in range(n)[::-1]:
  v=TS[i]
  for g in edge_r[v]:
    R[g]+=R[v]+1
ans=0
mod=10**9+7
for a,b in E:
  ans+=(L[a]+1)*(R[b]+1)
print(ans%mod)