#include <iostream>
#include <vector>

using namespace std;

int n;
vector<int> G[100005];

int main(void)
{
	cin >> n;
	int u, v;
	for(int i = 0; i < n-1; i++){
		cin >> u >> v;
		G[u].push_back(v);
		G[v].push_back(u);
	}
	
	int ans = 0;
	for(int i = 1; i <= n; i++){
		if(G[i].size() > 2) ans += G[i].size() - 2;
	}
	cout << ans << endl;
	
	return 0;
}