#include <algorithm>
#include <bitset>
#include <cassert>
#include <cctype>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>

#define REP(i,s,n) for(int i=(int)(s);i<(int)(n);i++)

using namespace std;
typedef long long int ll;
typedef vector<int> VI;
typedef pair<int, int> PI;
const double EPS=1e-9;

const int N = 10010;

int a[N];

int main(void){
  ll n,m;
  cin >> n >> m;
  n /= 1000;
  n %= m;
  // C(m, n)
  REP(i, 0, n) {
    a[i] = m - i;
  }
  REP(i, 2, n + 1) {
    REP(j, 0, n) {
      if (a[j] % i == 0) {
	a[j] /= i;
	break;
      }
    }
  }
  ll sum = 1;
  const ll mod = 1e9;
  REP(i, 0, n) {
    sum *= a[i];
    sum %= mod;
  }
  cout << sum << endl;
}