#include<bits/stdc++.h>
#define F first
#define S second
#define MP make_pair
#define pb push_back
#define endl '\n'

using namespace std;

typedef long long LL;
typedef pair< int, int > P;
typedef pair< LL, LL > LP;
typedef pair< int, P > iP;
typedef pair< P, P > PP;

static const int INF = INT_MAX;
static const LL LINF = LLONG_MAX;
static const int MIN = INT_MIN;
static const LL LMIN = LLONG_MIN;
static const int MOD = 1000000007;

int dx[] = {0, -1, 1, 0};
int dy[] = {-1, 0, 0, 1};

vector< int > v[100005];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    for( int i = 0; i < n - 1; ++i ) {
        int a, b;
        cin >> a >> b;
        v[a].pb( b );
        v[b].pb( a );

    }

    int o_cnt = 0; //次数1のノードをカウント
    int more_cnt = 0; //次数3以上のノードをカウント
    for( int i = 1; i <= n; ++i ) {
        if( o_cnt < 2 && v[i].size() == 1 ) {
            ++o_cnt;

        } else if( v[i].size() == 1 || v[i].size() >= 3 ){
            ++more_cnt;

        }
    }

    cout << ( more_cnt > 0? more_cnt - 1 : more_cnt ) << endl;
    return 0;
}