using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        var n = rl();
        var m = rl();
        var mod = 1000000000;

        n /= 1000;
        n = n % m;

        var pas = new long[m + 1, m + 1];
        for(int i = 0; i < m + 1; i++)
        {
            for(int j = 0; j < m + 1; j++)
            {
                if (j == 0 || i == j)
                {
                    pas[i, j] = 1;
                    continue;
                }
                if (j > i) continue;
                pas[i, j] = pas[i, j] = (pas[i - 1, j - 1] + pas[i - 1, j]) % mod;
            }
        }

        Console.WriteLine(pas[m, n]);
    }

    #region Scan
    static int ri() { return int.Parse(Console.ReadLine()); }
    static long rl() { return long.Parse(Console.ReadLine()); }
    static double rd() { return double.Parse(Console.ReadLine()); }
    static string rs() { return Console.ReadLine(); }
    static int[] ria() { return Console.ReadLine().Trim().Split().Select(int.Parse).ToArray(); }
    static long[] rla() { return Console.ReadLine().Trim().Split().Select(long.Parse).ToArray(); }
    static double[] rda() { return Console.ReadLine().Trim().Split().Select(double.Parse).ToArray(); }
    static string[] rsa() { return Console.ReadLine().Trim().Split(); }
    static void mul(out int a, out int b) { var arr = ria(); a = arr[0]; b = arr[1]; }
    public void mul(out int a, out int b, out int c) { var arr = ria(); a = arr[0]; b = arr[1]; c = arr[2]; }
    public void mul(out int a, out int b, out int c, out int d) { var arr = ria(); a = arr[0]; b = arr[1]; c = arr[2]; d = arr[3]; }
    #endregion
}