#include <bits/stdc++.h>
using namespace std;

#include <boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;

using bint = cpp_int;

template <typename T, typename U> bool cmin(T &a, U b) { return a > b && (a = b, true); }
template <typename T, typename U> bool cmax(T &a, U b) { return a < b && (a = b, true); }

signed main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);

  long N, M;
  cin >> N >> M;

  N %= M * 1000;
  N /= 1000;

  auto com = [&](auto n, auto k) {
    bint ret = 1;
    for (int i = 0; i < k; i++) {
      ret *= n - i;
      ret /= i + 1;
    }
    return ret;
  };
  
  cout << com(M, N) % 1000000000 << "\n";
}