/* -*- coding: utf-8 -*-
 *
 * 2638.cc:  No.2638 Initial fare - yukicoder
 */

#include<cstdio>
#include<vector>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

typedef long long ll;
typedef vector<int> vi;

/* global variables */

vi nbrs[MAX_N];
int ps[MAX_N], cis[MAX_N], ss[MAX_N][3];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 1; i < n; i++) {
    int u, v;
    scanf("%d%d", &u, &v);
    u--, v--;
    nbrs[u].push_back(v);
    nbrs[v].push_back(u);
  }

  for (int u = 0; u < n; u++) ss[u][0] = 1;
  ll sum = 0;
  ps[0] = -1;
  
  for (int u = 0; u >= 0;) {
    vi &nbru = nbrs[u];
    int up = ps[u];

    if (cis[u] < nbru.size()) {
      int v = nbru[cis[u]++];
      if (v != up) {
	ps[v] = u;
	u = v;
      }
    }
    else {
      if (up >= 0) {
	sum +=
	  (ll)ss[up][0] * (ss[u][0] + ss[u][1] + ss[u][2]) +
	  (ll)ss[up][1] * (ss[u][0] + ss[u][1]) +
	  (ll)ss[up][2] * (ss[u][0]);
	ss[up][1] += ss[u][0];
	ss[up][2] += ss[u][1];
      }

      u = up;
    }
  }

  printf("%lld\n", sum);
  
  return 0;
}