#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Vi = vector<int>;
using Pii = pair<int,int>;
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define rep(i,b,e) for(int i = (b); i < (e); i++)
#define each(a, x) for(auto& a : (x))
#define all(x) (x).begin(),(x).end()
#define sz(x) int((x).size())

void solve() {
    int n;
    cin >> n;
    Vi deg(n+1);
    for (int i = 0; i < n-1; i++) {
        int a, b;
        cin >> a >> b;
        deg[a]++;
        deg[b]++;
    }
    int res = 0;
    for (int i = 1; i <= n; i++) {
        res += max(0, deg[i] - 2);
    }
    cout << res << endl;
}

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(12);
    solve();
	return 0;
}