import java.io.*; import java.util.*; public class Main { static ArrayList> graph = new ArrayList<>(); static long ans = 0; public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); for (int i = 0; i < n; i++) { graph.add(new ArrayList<>()); } int[] counts = new int[n]; for (int i = 0; i < n - 1; i++) { int a = sc.nextInt() - 1; int b = sc.nextInt() - 1; graph.get(a).add(b); counts[b]++; } int idx = 0; for (int i = 0; i < n; i++) { if (counts[i] == 0) { idx = i; break; } } getCount(idx, 1); System.out.println(ans); } static int getCount(int idx, long depth) { int count = 1; for (int x : graph.get(idx)) { int tmp = getCount(x, depth + 1); count += tmp; ans += tmp * depth; } return count; } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }