import java.util.*;
import java.io.*;

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