#include<cstdio>
#define lim 5005
#define mod 2000003
int a[lim],n,k;
int comb(int n,int k){
	a[0]=1;
	if(k>n)
		return 1;
	for(int i=1;i<=n;++i)
		for(int j=1;j<=i;++j){
			a[j]=a[j]+a[j-1];
			if(a[j]>=mod)
				a[j]-=mod;
		}
	return a[k];
}
int main (){
	freopen("sandokan.in","r",stdin);
	freopen("sandokan.out","w",stdout);
	scanf("%d%d",&n,&k);
	printf("%d\n",comb(n-1,(n-1)%(k-1)));
	return 0;
}