#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<ctime>
#include<cctype>
#include<climits>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<memory>
#include<functional>
 
using namespace std;
 
#define ALL(g) (g).begin(),(g).end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define F(i,j,k) fill(i[0],i[0]+j*j,k)
#define P(p) cout<<(p)<<endl;
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define INF 1<<25
#define pb push_back
 
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<double> vd;
typedef pair<int,int> pii;
typedef pair<long,long> pll;
typedef long long ll;

	ll pascal[10001][10001];
int main(){
	ll N,M;
	ll mod=1e9;
	cin>>N>>M;
	for(int i=0;i<=10000;i++){
		for(int j=0;j<=i;j++){
			if(j==0)pascal[i][j]=1;
			else
				pascal[i][j]=(pascal[i-1][j]+pascal[i-1][j-1])%mod;
		}
	}
	cout<<pascal[M][N/1000%M]<<endl;
	return 0;
}