#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

vector<vector<int>> g;

int main() {
  int N;
  cin >> N;
  g.resize(N);
  vector<int> cnt(N);
  vector<int> a(N - 1), b(N - 1);
  for(int i = 0;i < N - 1;i++) {
    cin >> a[i] >> b[i];
    a[i]--;
    b[i]--;
    g[a[i]].push_back(b[i]);
    g[b[i]].push_back(a[i]);
    cnt[a[i]]++;
    cnt[b[i]]++;
  }

  i64 ans = 0;

  for(int i = 0;i < N;i++) {
    if(cnt[i] >= 2) {
      ans += cnt[i] - 2;
    }
  }
  cout << ans << endl;
}