#include <bits/stdc++.h>

using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> D(N+1);
    for (int i = 1; i < N; i++) {
        int a,b;
        cin >> a >> b;
        D[a]++;
        D[b]++;
    }
    int s = 0;
    for (int i = 0; i < N; i++) {
        if (D[i] > 2) {
            s += D[i]-2;
        }
    }
    cout << s << endl;
}