using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var mod = 998_244_353;
        var sq = (int)Math.Sqrt(m);
        var ans = 0L;
        for (var k = 1; k < sq && k <= n; ++k)
        {
            ans = (ans + m % k) % mod;
        }
        for (var rk = 1; rk <= sq; ++rk)
        {
            var mink = m / (rk + 1) + 1;
            mink = Math.Max(mink, sq);
            var maxk = m / rk;
            maxk = Math.Min(maxk, n);
            if (mink <= maxk)
            {
                var count = maxk - mink + 1;
                ans = (ans + m * count - (mink + maxk) * count / 2 % mod * rk) % mod;
            }
        }
        if (n > m) ans = (ans + m * (n - m) % mod) % mod;
        WriteLine(ans);
    }
}