#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

const mint inv2 = mint(2).inv();

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll n;
  cin >> n;
  mint ans;
  auto cmb2 = [](mint x) {
    return x * (x - 1) * inv2;
  };
  for (ll dl = 1; dl <= n;) {
    ll v_ll = n / dl;
    ll dr = n / v_ll;
    mint v = v_ll;
    ans += cmb2(v) * (dl + dr) * (dr - dl + 1) * inv2;
    ll rl = n % dl;
    ll rr = n % dr;
    ans += v * (rl + 1 + rr + 1) * (dr - dl + 1) * inv2;
    dl = dr + 1;
  }
  cout << ans.val() << '\n';
}