#include <bits/stdc++.h>
#include <assert.h>

using namespace std;

int main()
{
  int n;
  cin >> n;
  n--;
  vector<pair<int, int>> edge(n);
  map<int, int> cnt;
  for (int i = 0; i < n; i++)
  {
    int a, b;
    cin >> a >> b;
    if(b<a)swap(a,b);
    cnt[a]++;
    edge[i] = {a, b};
  }
  int ans = 0;
  for (pair<int, int> i : cnt)
    ans += max(0, i.second - 2);
  cout << ans << endl;

  return 0;
}