#include <iostream>
#include <vector>
using namespace std;
using ll = long long;

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