n = int(input())
g = [[] for _ in range(n)]
for i in range(n-1):
    a,b = map(int,input().split())
    g[a-1].append(b-1)
    g[b-1].append(a-1)
 
order = []
st = [0]
parent = [-1]*n
while st:
    v = st.pop()
    order.append(v)
    for c in g[v]:
        if c != parent[v]:
            st.append(c)
            parent[c] = v

size = [1]*n
for i in order[::-1]:
    if i==0: break
    size[parent[i]] += size[i]
    
v = 0
for i in range(n):
    v += size[i]*(n-size[i])

MOD = 998244353
c = n*(n-1)*(n-1)//2%MOD
p = v*pow(c,MOD-2,MOD)%MOD
print((1-p)%MOD)