#include <iostream>
#include <vector>
using namespace std;
struct SieveEratos{
  vector<bool> t;
  SieveEratos(int n):t(n+1,true){
    t[0] = t[1] = false;
    for(int i = 2; n >= i; i++){
      if(t[i]){
        for(int j = i+i; n >= j; j+=i){
          t[j] = false;
        }
      }
    }
  }
  bool operator[](int x){return t[x];}
};
const int mod = 1000000000;
long long C(int n,int r,vector<int> P){
	//nCr = nC(n-r)
	if(r > n/2)r = n-r;

	int a[n];for(int i = 0; r > i; i++)a[i] = n-i;

	for(int p:P){
		//素数p > rだったらforに入らないので
		if(p > r)break;
		for(int q = p; r >= q; q *= p){
			int m = n%q;
			for(int i = m, j = 0; r/q > j;i+=q,j++){
				//cout << i << " " << p << endl;
				a[i]/=p;
			}
		}
	}
	
	long mul = 1;
	for(int i = 0; r > i; i++){
		//cout << a[i] << " ";
		mul = (mul*a[i])%mod;
	}
	//cout << endl;
	return mul;

}
int main(){
	vector<int> P;
	SieveEratos A(10000);
	for(int i = 0; 10000 > i; i++){
		if(A[i])P.push_back(i);
	}
	long long n,m;cin>>n>>m;

	n = n/1000;
	int N = m;
	int R = n%m;

	cout << C(N,R,P) << endl;
}