#include <iostream>
#include <algorithm>
using namespace std;
#define MOD 1000000000
typedef long long LL;
int upper[10010];
int lower[10010];

int main(){
  LL n,m;
  cin >> n >> m;
  LL equal = n/1000/m*1000; //一人がもらえる量
  LL rest = n - equal * m;
  LL rest_maisuu = rest/1000;
  upper[0] = upper[1] = 1;
  for(int i=2;i<=m;++i){
    for(int j=0;j<=i;++j){
      lower[j] = (upper[j-1]+upper[j])%MOD;
    }
    for(int j=1;j<=i+1;++j) upper[j] = lower[j];
    //    for(int j=1;j<=i+1;++j) cout << lower[j] << " ";
    //    cout << endl;
  }
  if(rest_maisuu==0) cout << 1 << endl;
  else cout << lower[rest_maisuu] << endl;
  return 0;
}