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

typedef long long ll;
typedef double lf;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define TRACE(x) cerr << #x << ' ' << x << endl
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define _ << ' ' <<

#define fi first
#define sec second
#define se second
#define mp make_pair
#define pb push_back

const int MAXN = 300100;

int n;

vector <int> v[MAXN];

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cin >> n;
  REP(i, n - 1) {
    int a, b;
    cin >> a >> b;
    v[a].pb(b);
    v[b].pb(a);
  }

  ll sol = 0;
  REP(i, MAXN) {
    sol += max(0, (int)v[i].size() - 2);
  }

  cout << sol << endl;
  return 0;
}