import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Main {
	static int n;
	static List<List<Integer>> list;
	static long ans = 0;

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		n = Integer.parseInt(br.readLine());
		list = new ArrayList<>(n);
		for (int i = 0; i < n; i++) {
			list.add(new ArrayList<>());
		}
		boolean[] in = new boolean[n];
		for (int i = 0; i < n - 1; i++) {
			String[] sa = br.readLine().split(" ");
			int a = Integer.parseInt(sa[0]) - 1;
			int b = Integer.parseInt(sa[1]) - 1;
			list.get(a).add(b);
			if (in[b]) {
				throw new Exception();
			}
			in[b] = true;
		}
		br.close();

		int root = 0;
		for (int i = 0; i < in.length; i++) {
			if (!in[i]) {
				root = i;
				break;
			}
		}
		dfs(root, -1, 1);
		System.out.println(ans % 1000000007);
	}

	static long dfs(int x, int p, long size) {
		long cnt = 0;
		for (int next : list.get(x)) {
			if (next != p) {
				cnt += dfs(next, x, size + 1);
			}
		}
		ans += cnt * size;
		return cnt + 1;
	}
}