#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using ld=long double;
using ull=unsigned long long;
using pii=pair<int,int>;
using pll=pair<ll,ll>;
using mint=modint998244353;
const ll INF=1ll<<60;
int main(){
  int N; cin>>N;
  if(N>1200000)return 0;
  mint ans=0;
  for(int i=1;i<=N;i++){
    ll a=N/i,b=N%i;
    ans+=(a*(a-1)/2)*i+b*a+a;
  }
  cout<<ans.val()<<endl;
}