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

class Program
{
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static void Main()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var mod = 998_244_353;

        var (bits, bitc) = Bits(m);
        var dp = new long[31];
        var mbit = 0;
        for (var i = 0; i < bits.Length; ++i)
        {
            var next = (long[]) dp.Clone();
            for (var j = 0; j + 1 < dp.Length; ++j)
            {
                next[j + 1] = (next[j + 1] + dp[j]) % mod;
            }
            if (bits[i] == 1)
            {
                next[mbit] = (next[mbit] + 1) % mod;
                ++mbit;
            }
            dp = next;
        }
        dp[mbit] = (dp[mbit] + 1) % mod;

        var res = 0L;
        for (var i = 0; i < dp.Length; ++i)
        {
            res = (res + Exp(n, i, mod) * dp[i] % mod) % mod;
        }
        WriteLine(res);
    }
    static (int[] bits, int bitc) Bits(int m)
    {
        var list = new List<int>();
        while (m > 0)
        {
            list.Add(m % 2);
            m >>= 1;
        }
        list.Reverse();
        return (list.ToArray(), list.Sum());
    }
    static long Exp(int n, int k, int mod)
    {
        if (k == 0) return 1;
        if (k == 1) return n % mod;
        var half = Exp(n, k / 2, mod);
        var result = (half * half) % mod;
        return ((k % 2) == 0) ? result : ((result * n) % mod);
    }
}