#include <bits/stdc++.h>
using namespace std;
#include <atcoder/modint>
using namespace atcoder;
#ifdef DEFINED_ONLY_IN_LOCAL
#include <dump.hpp>
#define dump(...) cpp_dump(__VA_ARGS__)
#else
#undef dump
#define dump(...)
#endif
#define rep(i, n) for (int i = 0; i < n; i++)
template <class T> istream& operator>>(istream& I, vector<T>& V) { for (T& X : V) I >> X; return I; }

using mint = modint998244353;
int main() {
    long n;
    cin >> n;
    if (n > 1e7) {
        return 0;
    }
    mint ans;
    for (int i = 1; i <= n; i++) {
        for (int j = i; j <= n; j += i) {
            ans += j / i * (i - max<long>(0, (j + i - 1) - n));
        }
    }
    cout << ans.val() << endl;
    return 0;
}