#include <bits/stdc++.h>
using namespace std;
int main (){
    int n,x;
    cin >> n;
    vector<int> v(n,0);

    for(int i=0;i<2*(n-1);i++){
        cin >> x;
        v.at(x-1) += 1;
    }//input

    if(v.at(0)-2 <0){cout << 0 << endl;}
    else{cout << v.at(0)-2 << endl;}
}