#include <iostream>
#include <vector>
#include <utility>

using namespace std;
using ll = long long int;

#define PREPARED_ENVIRONMENT

template <class T> std::ostream& operator<<(std::ostream& o, const std::vector<T>& v) {
  o << "{";
  for (int i = 0; i < (int) v.size(); i++)
    o << (i > 0 ? ", " : "" ) << v[i];
  o << "}";
  return o;
}

template <class X, class Y> std::ostream& operator<<(std::ostream& o, const std::pair<X, Y>& p) {
  o << "(" << p.first << ", " << p.second << ")";
  return o;
}

ll n;
ll ans = 0;
vector<vector<ll>> graph;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> n;
  graph = vector<vector<ll>>(n);
  for (int i = 0; i < (n - 1); i++) {
    int a, b;
    cin >> a >> b;
    a--; b--;
    graph[a].push_back(b);
    graph[b].push_back(a);
  }
  for (int i = 0; i < n; i++) {
    ans += max(0, (int) (graph[i].size())-2);
  }
  cout << ans << "\n";
  return 0;
}