#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        a[u - 1]++, a[v - 1]++;
    }

    int ret = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] > 2)ret++;
    }
    cout << ret << endl;
    return 0;
}