#include <iostream>
#include <algorithm>
#include <vector>
#include <string>

using namespace std;

vector<int> G[100000];

int main() {
  int N;
  cin >> N;
  for (int i = 0; i < N - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    G[u].push_back(v);
    G[v].push_back(u);
  }
  int ans = 0;
  for (int i = 0; i < N; i++) {
    if (G[i].size() >= 3) {
      ans += G[i].size() - 2;
    }
  }
  cout << ans << '\n';
}