mod = 998244353
n = int(input())
Adj = [set() for _ in range(n)]
for _ in range(n-1):
    u, v = map(int, input().split())
    Adj[u-1].add(v-1)
    Adj[v-1].add(u-1)
Parent = [-1]*n
Size = [0]*n
D = [0]
while D:
    v = D.pop()
    for nxt in Adj[v]:
        if nxt != Parent[v]:
            Parent[nxt] = v
            D.append(nxt)
            
for i in range(n-1, 0, -1):
    Size[i] += 1
    for child in Adj[i]:
        if child != Parent[i]:
            Size[i] += Size[child]
ans = 0
cff = pow((n*(n-1)**2)//2, mod-2, mod)
for i in range(1, n):
    s = Size[i]
    ans += s*(n-s)
    ans %= mod
print(mod-ans*cff%mod)