import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
G = [[] for _ in range(N)]
for _ in range(N-1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    G[a].append(b)
    G[b].append(a)

par = [-1] * N
que = [0]
topo = []
while que:
    s = que.pop()
    topo.append(s)
    for t in G[s]:
        if t == par[s]:
            continue
        par[t] = s
        que.append(t)
        G[t].remove(s)

ans = 0
mod = 998244353
size = [1] * N
topo.reverse()

choice = N * (N - 1) * (N - 1)
choice_inv = pow(choice, mod-2, mod)

for s in topo[:-1]:
    p = par[s]
    size[p] += size[s]

    x = size[s]
    y = N - size[s]
    ans += x * (x - 1) * choice_inv % mod
    ans += y * (y - 1) * choice_inv % mod
    ans %= mod


print(ans)