#include <bits/stdc++.h>
#define MOD 1000000000
#define MAX 10001
typedef long long ll;
using namespace std;

ll N, M;

ll dp[MAX][MAX] = {{0}};

ll nCr(ll n, ll r)
{
       if(n==r) return dp[n][r] = 1;
       if(r==0) return dp[n][r] = 1;
       if(r==1) return dp[n][r] = n;
       if(dp[n][r]) return dp[n][r] % MOD;
       return dp[n][r] = nCr(n-1,r) + nCr(n-1,r-1);
}

int main(void){
    
    cin >> N >> M;
    cout << nCr(M, (N / 1000) % M) % MOD << endl;

    
    return 0;
}