#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll, int> PL;
constexpr int mod = 1e9+7;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
 
  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  vector<int> deg(n, 0);
  vector<vector<int>> g(n);
  rep(i,n - 1) {
    int a, b;
    cin >> a >> b;
    a--; b--;
    g[a].emplace_back(b);
    deg[b]++;
  }

  int root = -1;

  for (int i = 0; i < n; i++) {
    if (!deg[i]) root = i;
  }

  vector<mint> dp1(n, 0), dp2(n, 0);
  mint res = 0;

  auto dfs = [&](auto& f, int u)->void{
    dp1[u] += 1;
    for (auto v : g[u]) {
      dp1[v] += dp1[u];
      f(f, v);
      dp2[u] += dp2[v];
    }
    res += dp1[u] * dp2[u];
    dp2[u] += 1;
  };

  dfs(dfs, root);

  cout << res << endl;
  return 0;
}