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, x, y) = (c[0], c[1], c[2]);
        if (x > y) (x, y) = (y, x);
        if (x > 1) ++x;
        if (y < n) --y;
        if (x > 0)
        {
            y -= x;
            x = 0;
        }
        if (y < 0)
        {
            WriteLine(0);
            return;
        }
        var mod = 998_244_353;
        var dp = new long[y + 1];
        dp[0] = 1;
        for (var i = 0; i < dp.Length; ++i)
        {
            if (i + 3 < dp.Length) dp[i + 3] = (dp[i + 3] + dp[i]) % mod;
            if (i + 1 < dp.Length) dp[i + 1] = (dp[i + 1] + dp[i]) % mod;
        }
        WriteLine(dp.Last());
    }
}