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]);
        if (n == 1)
        {
            WriteLine(1);
            return;
        }
        var dp = new long[m + 1];
        var mod = 998_244_353;
        dp[0] = 1;
        for (var i = 1; i <= m; ++i)
        {
            if (i > 0) dp[i] = (dp[i] + dp[i - 1]) % mod;
            if (i >= n) dp[i] = (dp[i] + dp[i - n]) % mod;
        }
        WriteLine(dp[^1]);
    }
}