def invmod(a,mod):#mod逆元
    if a == 0:
        return 0
    if a == 1:
        return 1
    return (-invmod(mod % a, mod) * (mod // a)) % mod

N = int(input())
lsg = [[]  for i in range(N)]
mod = 998244353
for i in range(N-1):
    u,v = map(int,input().split())
    u -= 1
    v -= 1
    lsg[u].append(v)
    lsg[v].append(u)

he = dict()
chil = [0]*N
used = [False]*N
def dfs(p,n):
    if used[n]:
        return chil[n]
    chil[n] = 1
    for j in lsg[n]:
        if j == p:
            continue
        d = dfs(n,j)
        chil[n] += d
        he[(j,n)] = d
    return chil[n]
dfs(-1,0)
al = (N-1)*N*(N-1)//2
for v in he.values():
    al -= v*(N-v)
al %= mod
a = (N-1)*N*(N-1)//2
av = invmod(a, mod)
print((al*av)%mod)