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

public class Main {
	static int n;
	static long ng;
	static List<List<Integer>> list;

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

		int mod = 998244353;
		dfs(0, -1);
		long total = (long) n * (n - 1) / 2 * (n - 1);
		long ok = total - ng;
		total %= mod;
		ok %= mod;
		long mt = modinv(total, mod);
		long ans = ok * mt % mod;
		System.out.println(ans);
	}

	static int dfs(int x, int p) {
		int ret = 1;
		for (int i : list.get(x)) {
			if (i != p) {
				int res = dfs(i, x);
				ret += res;
			}
		}
		ng += (long) ret * (n - ret);
		return ret;
	}

	static long modinv(long a, int m) {
		long b = m;
		long u = 1;
		long v = 0;
		long tmp = 0;

		while (b > 0) {
			long t = a / b;
			a -= t * b;
			tmp = a;
			a = b;
			b = tmp;

			u -= t * v;
			tmp = u;
			u = v;
			v = tmp;
		}

		u %= m;
		if (u < 0) u += m;
		return u;
	}
}