#include <bits/stdc++.h>
using namespace std;
#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main(){
  int n; cin >> n;
  mint dp = 0;
  for (int i(3);i <= n;++i){
    mint t = mint(2).pow(i-1);
    dp = dp*t*(t/2);
    dp -= (t/4-1)*(t/2)*(t/2);
    dp += (t/2+1)*(t/2)/2-1;
  }
  cout << (dp+1).val() << endl;
}