#include <bits/stdc++.h>
using namespace std;

using ll = long long;
constexpr int mod = 998244353;

int main(void) {
	ll N;
	cin >> N;
	
	if(N > 2e6) return 1;
	
	ll ans = 0;
	for(ll j = 1; j <= N; ++j) {
		ans = (ans +  (N / j) * (N / j - 1) / 2 * j % mod) % mod;
		ans = (ans + (N / j) * (N % j + 1) % mod) % mod;
	}
	
	cout << ans << "\n";
	
	return 0;
}