#include <bits/stdc++.h>

using namespace std;

const int N = 3e5 + 7;

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

int main(){
	scanf("%d", &n);
	for(int i = 1; i < n; ++i){
		int u, v;
		scanf("%d %d",&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;
	printf("%d\n", ans);
	return 0;
}