#include <iostream>
#include <vector>

using namespace std;

int main()
{
    int N;
    while (cin >> N)
    {
        vector<int> Cs(N, 0);
        for (int i = 0; i < N - 1; i++)
        {
            int f, s;
            cin >> f >> s;
            f--;
            s--;
            Cs[f]++;
            Cs[s]++;
        }

        int ret = 0;
        for (int i = 0; i < N; i++)
        {
            if (Cs[i] > 2)
                ret += Cs[i] - 2;
        }

        cout << ret << "\n";
    }

    return 0;
}