#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all> 
using mint = atcoder::modint998244353;
#define int long long
signed main() {
  int n;
  cin >> n;
  int ans = 0;
  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= n; j++) {
      int l = i*j, r = (i+1)*j-1;
      if(l > n) break;
      ans+=i*(min(n,r)-min(n,l-1));
      //cout << i << ' ' << j << ' ' << ans << endl;
      ans%=998244353;
    }
    
  }
  ans%=998244353;
  cout << ans << endl;
}