#include<stdio.h>
#define N 2000003
int main () {
	freopen("sandokan.in","r",stdin);
	freopen("sandokan.out","w",stdout);
	int n,k,v[5000],i,p=1,j,aprim[5000],bprim[5000],cn,ck,q=0;
	scanf("%d%d",&n,&k);
	//for(i=0;i<n;++i)
	//	scanf("%d",&v[i]);
	cn=n;
	while(cn>=k)
		cn=cn-k+1;
	k=cn;
	--n;--k;
	for(i=0;i<=n;++i)
		aprim[i]=bprim[i]=1;
	for(i=2;i<=n;++i)
        if(aprim[i])
            for(j=i+i;j<=n;j+=i)
                aprim[j]=bprim[j]=0;
	cn=n;
	ck=k;
	while(k){
		++q;
		for(i=2;i<=cn&&n!=1;++i)
			if(aprim[i])
				while(!(n%i)){
					n/=i;
					++aprim[i];
				}
		for(i=2;i<=ck&&k!=1;++i)
			if(bprim[i])
				while(!(k%i)){
					k/=i;
					++bprim[i];
				}
		n=cn-q;
		k=ck-q;
	}
	for(i=2;i<=cn;++i){
		if(bprim[i]>1)
			aprim[i]-=bprim[i];
		if(bprim[i]==1)
			--aprim[i];
	}
	for(i=2;i<=cn;++i)
		while(aprim[i]>=1){
			p=(p*i)%N;
			--aprim[i];
		}
	printf("%d\n",p);
	return 0;
}