#include <iostream>

using namespace std;

int main() {
    int count;
    cin >> count;

    int links[count];

    for (int j = 0; j < count; ++j) {
        links[j] = 0;
    }

    int l, r;
    for (int i = 0; i < count - 1; ++i) {
        scanf("%d %d", &l, &r);
        links[l]++;
        links[r]++;
    }

    int result = 0;

    for (int k = 0; k < count; ++k) {
        if (links[k] > 2) {
            result += links[k] - 2;
        }
    }

    cout << result << endl;

    return 0;
}