#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
long long mod = 998244353;
int main() {
	long long n, m;
	cin >> n >> m;
	long long ans = 0;
	for (long long i = 1; (i <= m && i * i <= n); i++) {
		long long a = n / i;
		ans += a * (a + 1) / 2 * i + a * i % mod;
		ans %= mod;
	}
	for (long long i = 1; i * i < n; i++) {
		long long b = n / i, c = n / (i + 1);
		b = min(b, m), c = min(c, m);
		ans += i * (i + 1) / 2 * (b + c + 1) * (b - c) / 2;
		ans %= mod;
		ans += (b + c + 1) * (b - c) / 2 * i;
		ans %= mod;
	}
	cout << ans << endl;
}