from collections import deque
from sys import stderr, setrecursionlimit

setrecursionlimit(200000)

MOD = 998244353

N = int(input())
edges = [[] for _ in range(N + 1)]
for _ in range(N - 1):
	u, v = map(int, input().split())
	edges[u].append(v)
	edges[v].append(u)

parent = [-1] * (N + 1)
parent[1] = 0
children = [[] for _ in range(N + 1)]
q = deque([1])
while q:
	p = q.popleft()
	for n in edges[p]:
		if parent[n] != -1:
			continue
		parent[n] = p
		children[p].append(n)
		q.append(n)

descendant = [0] * (N + 1)


def bfs(n):
	if not children[n]:
		descendant[n] = 1
		return 1
	descendant[n] = sum(bfs(c) for c in children[n]) + 1
	return descendant[n]


bfs(1)

# print(descendant, file=stderr)

# ans = a / b
a = N * (N - 1)**2 // 2
b = N * (N - 1)**2 // 2

for n in range(2, N + 1):
	a -= descendant[n] * (N - descendant[n])

print(a * pow(b, MOD - 2, MOD) % MOD)