#include <bits/stdc++.h>
using namespace std;
int n, branch[10001], total;
int main() {
  cin >> n;
  for (int i = 0; i < n - 1; i++) {
    int a, b;
    cin >> a >> b;
    branch[a]++, branch[b]++;
  }
  for (int i = 1; i <= n; i++) total += branch[i] * (branch[i] - 1) / 2;
  cout << total << endl;
}
