#include <bits/stdc++.h>

#include <atcoder/modint>

int main() {
  using namespace std;
  cin.tie(nullptr)->sync_with_stdio(false);
  int n, m;
  cin >> n >> m;
  using Mint = atcoder::modint998244353;
  Mint ans;
  for (int d = 1; d <= min(m, int(1e5)); ++d) {
    Mint q = n / d;
    ans += d * q * (q + 3) / 2;
  }
  for (int d = int(1e5) + 1; d <= m;) {
    int q = n / d;
    int nd = min(n / q, m) + 1;
    ans += Mint(q) * (q + 3) / 2 * (d + nd - 1) * (nd - d) / 2;
    d = nd;
  }
  cout << ans.val() << '\n';
}