#include <bits/stdc++.h>   using namespace std;   int a[100005];   int main() {     int n;     while (cin >> n) {       int ans = 0;       for (int i = 1; i < n; i++) {         int x, y;         cin >> x >> y;         ans += a[x] + a[y];         a[x]++, a[y]++;       }       cout << ans << endl;     }     return 0;   }   