#include <bits/stdc++.h>

using namespace std;
typedef long long ll;


int main() {
    ll n;
    cin >> n;
    ll spoje[n] = {};
    for(int i = 0; i < n-1; i++) {
        ll a, b;
        cin >> a >> b;
        spoje[a]++;
        spoje[b]++;
    }
    ll counter = 0;
    for(int i = 0; i < n; i++) {
        if(spoje[i] > 2) {
            counter++;
        }
    }
    cout << counter << endl;
    return 0;
}