import java.util.*;

class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k[] = new int[n];
		for(int i = 1; i <= n-1; i++){
			k[sc.nextInt()-1]++;
			k[sc.nextInt()-1]++;
		}
		Arrays.sort(k);
		int ans = 0;
		for(int i = 2; i < n-1; i++){
			if(k[i] < 2){
				for(int j = i+1; j < n; j++){
					if(k[j] > 2){
						k[i]++;
						k[j]++;
						ans++;
					}
				}
				Arrays.sort(k);
				i=1;
			}
		}
		System.out.print(ans);
	}
}