#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#include <list>
#include <atcoder/all>
#define popcount __builtin_popcount
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<int, int> P;
int n;
vector<int> g[100010];
int dp[2][100010];
void dfs(int x, int p){
    dp[1][x]=1;
    for(auto y:g[x]){
        if(y==p) continue;
        dfs(y, x);
        dp[1][x]+=min(dp[0][y], dp[1][y]);
        dp[0][x]+=dp[1][y];
    }
}
int main()
{
    cin>>n;
    for(int i=0; i<n-1; i++){
        int a, b;
        cin>>a>>b;
        a--; b--;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    dfs(0, -1);
    cout<<min(dp[0][0], dp[1][0])<<endl;
    return 0;
}