#include <fstream>
#include <iomanip>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <stack>
#include <map>
#include <cstring>
#include <climits>
#include <unordered_map>

#define NMAX 5003
#define MOD 2000003

using namespace std;

ifstream fin("sandokan.in");
ofstream fout("sandokan.out");

int n, k;
int comb[NMAX][NMAX];

int main()
{
	fin >> n >> k;
	int m = n;
	while (m >= k)
	{
		m = m - k + 1;
	}

	//calculez comb de n luate cate m
	comb[1][1] = 1;
	comb[1][0] = 1;
	for (int i = 2; i <= n; i++)
	{
		comb[i][0] = 1;
		for (int j = 1; j <= i; j++)
		{
			comb[i][j] = comb[i - 1][j] + comb[i - 1][j - 1];
			comb[i][j] %= MOD;
		}
		comb[i][i] = 1;
	}
	fout << comb[n][m-1];
	return 0;
}