#include <iostream>
#include <fstream>

using namespace std;

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

int C[2][5003];

int main() {

    int n,k;
    in >> n >> k;

    int t = n;
    while(t >= k)
        t -= k-1;
    t--;
    n--;
    k--;

    for(int i = 0; i <= n; i++) {
        C[i%2][0] = 1;
        for(int j = 1; j <= t; j++) {
            C[i%2][j] = (C[!(i%2)][j-1] + C[!(i%2)][j])%2000003;
        }
    }

    out << C[(n)%2][t];

    return 0;
}