"""


"""

import sys
from sys import stdin

sys.setrecursionlimit(200000)

mod = 998244353
def dfs(v,p):
    global ans

    vnum = 1
    for nex in lis[v]:
        if nex != p:
            cn = dfs(nex,v)
            ans += cn * (N-cn)
            vnum += cn

    return vnum

N = int(stdin.readline())

lis = [ [] for i in range(N) ]

for i in range(N-1):
    u,v = map(int,stdin.readline().split())
    u -= 1
    v -= 1

    lis[u].append(v)
    lis[v].append(u)

ans = 0
dfs(0,0)
#print (ans,(N-1)*N*(N-1)//2)

print ((1-ans * pow((N-1)*N*(N-1)//2 , mod-2 ,mod)) % mod)