#include<bits/stdc++.h>

using namespace std;

const int maxn = 300042;

int deg[maxn];

int main() {
    ios_base::sync_with_stdio(0);
	cin.tie(0);

	int n;
	cin >> n;
	int n2 = n;
	n--;
	while(n--)
	{
		int a,b;
		cin >> a >>b;
		deg[a]++;
		deg[b]++;
	}
	int ans = 0;
	for(int i = 1; i <= n2; i++)
	{
		ans += max(0, deg[i] - 2);
	}
	cout << ans << '\n';
}