#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
vector<pair<long long, pair<long long, long long>>> quotient_ranges(long long N){
	vector<pair<long long, pair<long long, long long>>> ans;
	for (long long i = 1; i * i <= N; i++){
		ans.push_back(make_pair(N / i, make_pair(i, i)));
	}
	for (long long i = N / ((long long) sqrt(N) + 1); i >= 1; i--){
		ans.push_back(make_pair(i, make_pair(N / (i + 1) + 1, N / i)));
	}
	return ans;
}
long long ap(long long l, long long r){
  return (r + l) * (r - l + 1) / 2 % MOD;
}
int main(){
  int n, m;
  cin >> n >> m;
  vector<pair<long long, pair<long long, long long>>> Q = quotient_ranges(n);
  int cnt = Q.size();
  long long ans = 0;
  for (int i = 0; i < cnt; i++){
    long long q = Q[i].first;
    int l = Q[i].second.first;
    int r = Q[i].second.second;
    r = min(r, m);
    if (l > r){
      break;
    }
    ans += (q * (q + 1) / 2 + q) % MOD * ap(l, r) % MOD;
  }
  ans %= MOD;
  cout << ans << endl;
}