#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/modint>

using namespace std;
using ll = long long;
using ull = unsigned long long;
using mll = atcoder::static_modint<998244353>;
#define rep(i,n) for(int i=0; i<(n); i++)


int main(){
  int N; cin >> N;
  vector<vector<int>> E(N);
  rep(i,N-1){
    int u,v; cin >> u >> v; u--; v--;
    E[u].push_back(v);
    E[v].push_back(u);
  }
  vector<int> I = {0};
  vector<int> P(N,-1);
  for(int i=0; i<I.size(); i++){
    int p = I[i];
    for(int e : E[p]) if(P[e] == -1){
      P[e] = p;
      I.push_back(e);
    }
  }
  vector<int> Z(N,1);
  for(int i=N-1; i>=1; i--) Z[P[i]] += Z[i];

  mll ans = 0;
  for(int i=1; i<N; i++) ans += mll(Z[i]) * (N-Z[i]);
  ans = ans / N / (N-1) / (N-1) * 2;
  ans = 1 - ans;
  cout << ans.val() << "\n";
  return 0;
}


struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_instance;