#include <atcoder/all>
#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace atcoder;
using namespace std;

typedef long long ll;

using mint = modint998244353;

int main() {
    ll n;
    cin >> n;
    mint ans = 0;
    rep(i, 1, n + 1) {
        ll l = i, r = i * 2;
        while (1) {
            if (l > n)
                break;
            r = min(n + 1, r);
            ans += mint(r - l) * (l / i);
            l += i;
            r += i;
        }
    }
    cout << ans.val() << endl;
}