import sys
from collections import *
S=sys.stdin.readlines()
N=int(S[0])
G=[[] for i in range(N)]
a,b=0,0
Z=[True]*N
for i in range(N-1):
  a,b=map(int,S[i+1].split())
  G[a-1].append(b-1)
  Z[b-1]=False
r=0
for i in range(N):
  if Z[i]:
    r=i
Q=deque()
S=set()
def qao(x):
  global S,Q
  if x in S:
    return False
  S.add(x)
  Q.append(x)
  return True

D=[0]*N
def bfs(x):
  global Q,D,G
  v=0
  for i in range(len(Q)):
    v=Q.popleft()
    for j in range(len(G[v])):
      if qao(G[v][j]):
        D[G[v][j]]=x
  return len(Q)

qao(r)
for i in range(N):
  if bfs(i+1)==0:
    break
P=0
mod=10**9+7
for i in range(N):
  P=(P+D[i]*(D[i]+1)//2)%mod
print(P)