#include <bits/stdc++.h>
#define ll long long
#define REP(i, n) for(int i=0;i<n;i++)

using namespace std;

ll n;
ll arr[1000000] = {};

int main(){
    cin >> n;
    REP(i, n-1) {
        ll a, b;
        cin >> a >> b;
        arr[a]++;
        arr[b]++;
    }

    ll res = 0;
    REP(i, n){
        if(arr[i] > 2) res += arr[i] - 2;
    }

    cout << res << endl;
}