#include<bits/stdc++.h>
using namespace std;
using ll = long long;

#ifdef DEB
#define D if(1)
#else 
#define D if(0)
#endif

const int NMAX = 512345;

int a[NMAX];
int n;

int main()
{
	scanf("%d",&n);
	if(n==1)
	{
		printf("0\n");
		return 0;
	}
	for(int i=0;i<2*(n-1);i++)
	{
		int tmp;
		scanf("%d",&tmp);
		tmp--;
		a[tmp]++;
	}
	int out=0;
	for(int i=0;i<n;i++)
		if(a[i]==1) out++;
	printf("%d\n",out-2);
	return 0;
}