#include <bits/stdc++.h>
using namespace std;
const double PI = M_PI;
const int INF = -1 * 1e9;
const long long limit = -1 * 1e16;
const int MOD1 = 1e9 + 711;
const int MOD2 = 1e9 + 933;
const int MOD3 = 1e9 + 993;
const int maxn = 1e6 + 100;
int main() {
  cout.tie(0);
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  int n;
  cin >> n;
  vector<vector<int>> g(n + 1, vector<int>());
  for (int i = 0; i < n - 1; ++i) {
    int v, u;
    cin >> v >> u;
    g[v].push_back(u);
    g[u].push_back(v);
  }
  int sum = 0;
  for (int i = 1; i <= n; ++i) {
    for (int j = 0; j < g[i].size(); ++j) {
      sum += g[g[i][j]].size() - 1;
    }
  }
  cout << sum / 2;
  cerr << "\n\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
  return 0;
}
