#include <atcoder/all>
#include <bits/stdc++.h>
using ll = long long;
using ull = unsigned long long;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define REP(i, m, n) for(int i = (int)(m); i < (int)(n); i++)
using namespace std;
using namespace atcoder;
using mint = modint998244353;
const int inf = 1000000007;
const ll longinf = 1ll << 60;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    vector<vector<int>> g(n);
    rep(i, n - 1) {
        int x, y;
        cin >> x >> y;
        --x;
        --y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    ll ans = 0;
    auto dfs = [&](auto &&self, int x, int p) -> tuple<int, int, int> {
        int v0 = 1, v1 = 0, v2 = 0;
        for(auto to : g[x]) {
            if(to == p)
                continue;
            auto [d1, d2, d3] = self(self, to, x);
            ans += (ll)v0 * d1;
            ans += (ll)v0 * d2;
            ans += (ll)v0 * d3;
            ans += (ll)v1 * d1;
            ans += (ll)v1 * d2;
            ans += (ll)v2 * d1;
            v1 += d1;
            v2 += d2;
        }
        return {v0, v1, v2};
    };
    dfs(dfs, 0, -1);
    cout << ans << endl;
    return 0;
}