#include <cassert>
#include <iostream>
using namespace std;
constexpr int mod = 998244353;

int main() {
    long long N;
    cin >> N;

    // assert(N <= 1e7);

    __int128 ret = 0;
    for (long long d = 1; d <= N;) {
        const long long k = (N + 1) / d;
        long long r = (N + 1) / k;
        if (r > N) r = N;

        // [d, r]
        const long long sum = __int128(d + r) * (r - d + 1) / 2 % mod;

        ret += (long long)(__int128(k - 1) * k / 2 % mod) * sum % mod;

        long long mdsum = __int128(N + 1) * (r + 1 - d) % mod - sum * (k % mod) % mod;
        ret += (mdsum + mod) * (k % mod) % mod;

        d = r + 1;
    }

    cout << (long long)(ret % mod) << '\n';
}