#include <bits/stdc++.h>
#define MAX 10000
#define MOD 1000000000
typedef long long ll;
using namespace std;

ll N, M;

ll a[MAX + 1][MAX + 1] = {{0}};
ll nCr(ll n, ll r){
    for(int i = 0; i <= MAX; i++){
        for(int j = 0; j <= i; j++){
		    if(j == 0) a[i][j] = 1;
		    else a[i][j] = (a[i - 1][j] + a[i - 1][j - 1]) % MOD;
        }
	}
	return a[n][r];
}

int main(void){
    
    cin >> N >> M;
    cout << nCr(M, (N / 1000) % M) % MOD << endl;
    
    return 0;
}