#include <iostream>
#include <string>
#define MAX 1000000000
using namespace std;

typedef long long ll;

int main(void){
	ll n,m;

	cin>>n>>m;
	if(n<1000){
		cout<<0<<endl;
		return 0;
	}
	n/=1000;
	n%=m;
	ll s1=1,s2=1; // s1/s2
	for(int i=1;i<=n;i++){
		if(m-i+1>0) s1*=m-i+1;
		s1%=MAX;
		s2*=i;
		s2%=MAX;
	}
	cout<<(s1/s2)%MAX<<endl;
	return 0;
}