#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int n;
    cin>>n;
    vector<int> g[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);
    }
    int ans=0;
    for (int i=0;i<n;i++)
        if (g[i].size()>=3)
            ans+=g[i].size()-2;
    cout<<ans<<endl;
    return 0;
}