#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

constexpr ll mod=1e9+7;

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n; cin >> n;
	vector<vector<int>> g(n);
	for(int i=1;i<n;i++){
		int x,y; cin >> x >> y;
		x--; y--;
		g[x].push_back(y);
		g[y].push_back(x);
	}
	ll res=0;
	vector<ll> d(n);
	auto dfs=[&](auto dfs,int s,int p)->void{
		d[s]=1;
		for(int t:g[s]){
			if(t==p)continue;
			dfs(dfs,t,s);
			d[s]+=d[t];
		}
	};
	dfs(dfs,0,-1);
	res+=(ll)n*(ll)n;
	for(int i=0;i<n;i++){
		for(int t:g[i]){
			if(d[t]>d[i])continue;
			res+=d[t]*(n-d[t]);
		}
		res+=(ll)(n-d[i])*d[i];
	}
	printf("%lld\n",res);
}