//u64_Normal-2_rep3暫定

#define _GLIBCXX_DEBUG
#define ll long long
#define u64 uint64_t
#define rep(a, b, c) for(int i = a; i < b; i += c)
#define rep2(a, b, c) for(int j = a; j < b; j += c)
#define rep3(a, b, c) for(int k = a; k < b; k += c)
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void p(auto a){
  cout << a;
}

void ps(auto a){
  cout << a << " ";
}

void ps(){
  cout << " ";
}

void pl(auto a){
  cout << a << endl;
}

void pl(){
  cout << endl;
}

void fix15(){
  cout << fixed << setprecision(15);
}

void YES(){
  pl("YES");
}

void NO(){
  pl("NO");
}

void Yes(){
  pl("Yes");
}

void No(){
  pl("No");
}

void yes(){
  pl("yes");
}

void no(){
  pl("no");
}






Graph G(2e5+10);
ll ans = 0;

void bfs(int now, int dep, vector<bool> B){
  if(dep != 0) ans++;
  if(dep == 3) return;

  B[now] = true;

  for(auto p: G[now]){
    if(!B[p]) bfs(p, dep+1, B);
  }
}

//Normal-2
int main(){
  int N; cin >> N;

  rep(0, N-1, 1){
    int A, B; cin >> A >> B;

    G[A].push_back(B);
    G[B].push_back(A);
  }

  rep(1, N+1, 1){
    vector<bool> B(3e5, false);
    bfs(i, 0, B);
  }

  pl(ans/2);
}