import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    static int[][] counts;
    static int[] parents1;
    static int[] parents2;
    static long ans = 0;
    static List<List<Integer>> graph;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        graph = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            graph.add(new ArrayList<>());
        }
        IntStream.range(0, n - 1).forEach(i -> {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            graph.get(a).add(b);
            graph.get(b).add(a);
        });
        parents1 = new int[n];
        parents2 = new int[n];
        counts = new int[n][4];
        setValue(0, -1, -1);
        setAns(0, 0);
        System.out.println(ans / 2);
    }
    
    static void setValue(int idx, int p1, int p2) {
        counts[idx][0] = 1;
        parents1[idx] = p1;
        parents2[idx] = p2;
        graph.get(idx).stream().filter(x -> x != p1).forEach(x -> {
            setValue(x, idx, p1);
            for (int i = 1; i <= 3; i++) {
                counts[idx][i] += counts[x][i - 1];
            }
        });
    }
    
    static void setAns(int idx, int p) {
        for (int i = 1; i <= 3; i++) {
            ans += counts[idx][i];
        }
        if (parents1[idx] >= 0) {
            ans += counts[parents1[idx]][2] - counts[idx][1];
            ans += counts[parents1[idx]][1] - 1;
            ans++;
        }
        if (parents2[idx] >= 0) {
            ans += counts[parents2[idx]][1] - 1;
            ans++;
            if (parents2[idx] != 0) {
                ans++;
            }
        }
        graph.get(idx).stream().filter(x -> x != p).forEach(x -> setAns(x, idx));
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}