#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<ll,ll> ;
const ll INF = 1e18;
const int MOD = 1000000007;
int n = 100005;
vector<vector<int>> tree(n,vector<int>());

int main(){
    cin >> n;
    rep(i,n-1){
        int a,b;
        cin >> a >> b;
        --a;--b;
        tree[a].push_back(b);
        tree[b].push_back(a);
    }   
    int ans = 0;
    rep(i,n){
        if(tree[i].size() == 1) continue;
        else ans += tree[i].size() - 2;
    }
    cout << ans << endl;
    return 0;
}