//g++ 5.cpp -std=c++14 -I .
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;
#define fi first
#define se second
#define pb push_back

int x[100500];
int dist[100500];
int seen[100500]={};

void dfs(vector<vector<int>> &g,int now){
  seen[now]=1;
  int z=0;
  for(int next:g[now]){
    if(seen[next]==0){
      dist[next]=dist[now]+1;
      dfs(g,next);
      z+=x[next];
    }
  }
  x[now]=z+1;
}

int main(){
  int n;
  cin>>n;
  vector<vector<int>> g(n);
  int v[n-1][2];
  for(int i=0;i<n-1;i++){
    int a,b;
    cin>>a>>b;
    a--;
    b--;
    g[a].pb(b);
    g[b].pb(a);
    v[i][0]=a,v[i][1]=b;
  }
  dist[0]=0;
  dfs(g,0);
  ll ans=0;
  
  for(int i=0;i<n-1;i++){
    int a=v[i][0],b=v[i][1];
    if(dist[a]>dist[b]){
      swap(a,b);
    }
    ans+=((ll)x[b])*(n-x[b]);
  }
  ans*=2;
  ans+=(ll)n*n;
  cout<<ans<<endl;
}