#include<bits/stdc++.h>
using namespace std;
int dp[100005][3]={0};
vector<int>v[100005];
bool vis[100005];
void ins(int n)
{
	int i;
	for(i=0;i<n+100;i++)
	vis[i]=false;
}
void dfs(int i)
{
	int j;
	vis[i]=true;
	for(j=0;j<v[i].size();j++)
	{
		if(vis[v[i][j]]==false)
		{
			dfs(v[i][j]);
			dp[i][0]+=dp[v[i][j]][1];
			dp[i][1]+=min(dp[v[i][j]][1],dp[v[i][j]][0]);
		}
	}
	dp[i][1]++;
}
int main()
{
	int n,i,x,y;
	cin>>n;
	for(i=0;i<n-1;i++)
	{
		cin>>x>>y;
		v[x].push_back(y);
		v[y].push_back(x);
	}
	ins(n);
	dfs(1);
	cout<<min(dp[1][0],dp[1][1])<<endl;
	return 0;
}

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MTMKMSAyCjEgMwoxIDQKMSA1CjEgNgoxIDcKMiA4CjIgOQoyIDEwCjIgMTEKMiAxMgoyIDEzCg==

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