import math
import sys 
input = sys.stdin.buffer.readline

def main():
    N = int(input()); MOD = 998244353
    G = [[] for _ in range(N)]
    branch =[]
    for _ in range(N-1):
        u,v = map(int,input().split())
        u-=1;v-=1
        G[u].append(v)
        G[v].append(u)
        branch.append((u,v))
    root = 0
    cnt = [0]*N
    par = [-1]*N
    stack = []
    stack.append(~root)
    stack.append(root)
    while stack:
        v = stack.pop()
        if v >= 0:
            for u in G[v]:
                if u == par[v]: continue
                par[u] = v
                stack.append(~u)
                stack.append(u)
        else:
            v = ~v
            u = par[v]
            cnt[v] += 1
            if u == -1: continue
            cnt[u] += cnt[v]
    #print(cnt)
    y = (N-1)*N*(N-1)//2; y%=MOD
    x = y
    for u,v in branch:
        if v == par[u]:
            u,v = v,u
        #vの親がu. par[v] = u
        v_cnt = cnt[v]
        u_cnt = N - v_cnt
        x -= v_cnt*u_cnt%MOD
        x %= MOD
    #print(x,y)
    g = math.gcd(x,y)
    x //= g
    y //= g
    ans = x * pow(y,MOD-2,MOD)
    print(ans%MOD)

if __name__ == '__main__':
    main()