#include<iostream>
using namespace std;
int n;
struct EDGE{
	int to,next;
}e[100005];
struct NODE{
	int leafson,fa,cafe;
}node[100005];
int head[100005],cnt;
void addedge(int u,int v){
	e[++cnt].to=v;
	e[cnt].next=head[u];
	head[u]=cnt;
	node[v].fa=u;
}
int dfs(int x){
//	cout<<x<<endl;
	node[x].leafson++;
	if(head[x]==0){
		node[node[x].fa].leafson++;
		return 0;
	}
	for(int i=head[x];i;i=e[i].next){
		node[x].cafe+=dfs(e[i].to);
	}
	//cout<<x<<' '<<node[x].cafe<<' '<<node[x].leafson<<endl;
	node[x].cafe+=node[x].leafson/2;
	return node[x].cafe;
}

int main(){
	cin>>n;
	for(int i=1;i<=n-1;i++){
		int u,v;
		cin>>u>>v;
		addedge(u,v);
	}
	cout<<dfs(1)<<endl;
	return 0;
}

不清楚为啥输出全是0（本地正常）