#include "bits/stdc++.h"

using namespace std;

void solve()
{
	int n, ans = 0;
	cin >> n;
	map<int, int> mp;
	for (int x = 0; x < n - 1; x++)
	{
		int a, b;
		cin >> a >> b;
		mp[a]++;
		mp[b]++;
	}
	for (auto p : mp)
	{
		ans += max(p.second - 2, 0);
	}
	cout << ans << endl;
}

int main(void)
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}