import sys
input = sys.stdin.readline
from collections import deque
MOD = 10**9+7
class Tree:
  def __init__(self, N):
    self.V = N
    self.edge = [[] for _ in range(N)]
    self.to = [False]*N
  
  def add_edges(self, ind=1, bi=True):
    for i in range(self.V-1):
      a,b = map(int, input().split())
      a -= ind; b -= ind
      self.edge[a].append(b)
      self.to[b] = True
      if bi:
        self.edge[b].append(a)

  def add_edge(self, a, b, bi=True):
    self.edge[a].append(b)
    if bi:
      self.edge[b].append(a)

  def dfs(self):
    for v in range(self.V):
      if not self.to[v]:
        start = v
        break
    stack = deque([start])
    self.parent = [N]*N
    self.parent[start] = -1
    cnt = 0
    self.depth = [-1]*self.V
    self.depth[start] = 0
    #記録したい値の配列を定義
    while stack:
      v = stack.pop()
      for u in self.edge[v]:
        if u==self.parent[v]:
          continue
        self.parent[u]=v
        stack.append(u)
        self.depth[u] = self.depth[v]+1
        cnt += self.depth[u]*(self.depth[u]+1)//2
        cnt %= MOD
    return cnt
  
N = int(input())
G = Tree(N)
G.add_edges(ind=1, bi=False)
print(G.dfs())