#include<stdio.h>
#include<string.h>
#define mod 2000003
int n,p;
int v[3][5004];

inline int min(int a, int b)
{
	if(a<b)
		return a;
	return b;
}

int main()
{
	freopen("sandokan.in","r",stdin);
	freopen("sandokan.out","w",stdout);
	scanf("%d%d",&n,&p);
	int i,j,lim;
	n--;
	p--;
	v[0][0]=1;
	for(i=1;i<=n;i++)
	{
		v[i&1][0]=1;
		for(j=1;j<=i;j++)
			v[i&1][j]=(v[i-1&1][j-1]+v[i-1&1][j])%mod;
	}
	printf("%d\n",v[n&1][p]);
	return 0;
}