#include<bits/stdc++.h>
using namespace std;
using ll=long long;
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

const ll MOD=998244353;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll N;
    cin>>N;
    if(N>1'200'000)return 0;
    ll ans=0;
    for(ll i=1;i<=N;i++){
        ll b=(N/i)*i;
        ans+=(N/i-1)*(N/i)/2%MOD*i+(N-b+1)*(N/i)%MOD;
        ans%=MOD;
    }
    cout<<ans<<"\n";
}