#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<vector<int>> Graph(N);
    for(int i=0; i<N-1; i++){
        int u,v; cin >> u >> v;
        u--; v--;
        Graph.at(u).push_back(v);
        Graph.at(v).push_back(u);
    }

auto dp = [&](auto dp,int pos,int back) -> vector<long long> {
    long long ret = 0;
    long long one = 0,two = 0;
    for(auto to : Graph.at(pos)){
        if(to == back) continue;
        auto ko = dp(dp,to,pos);
        long long x = ko.at(0),y = ko.at(1),z = ko.at(2);
        ret += x+y+z+ko.back();
        ret += one*x+two*x+one*y;
        one++; two += y;
    }
    return {1,one,two,ret};
};
    vector<long long> result = dp(dp,0,-1);
    cout << result.back() << endl;
}