import java.util.*; import java.io.*; public class Main { static ArrayList> graph = new ArrayList<>(); static final int MOD = 1000000007; static long ans = 0; public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int n = Integer.parseInt(br.readLine()); int[] counts = new int[n]; for (int i = 0; i < n; i++) { graph.add(new ArrayList<>()); } for (int i = 0; i < n - 1; i++) { String[] line = br.readLine().split(" ", 2); int a = Integer.parseInt(line[0]) - 1; int b = Integer.parseInt(line[1]) - 1; graph.get(a).add(b); counts[b]++; } int root = 0; for (int i = 0; i < n; i++) { if (counts[i] == 0) { root = i; break; } } getChildren(root, 1); System.out.println(ans); } static int getChildren(int idx, int d) { int c = 1; for (int x : graph.get(idx)) { int tmp = getChildren(x, d + 1); ans += (long)d * tmp % MOD; ans %= MOD; c += tmp; } return c; } }