#include <bits/stdc++.h>
#define MOD 1000000000

using namespace std;

long long N, M;
long long dp[10001][10001] = {{0}};

long long rec(long long n, long long r)
{
    if (r == 0 || r == n) return 1;
    else if (r == 1) return n % MOD;
    if(dp[n][r] != 0) return dp[n][r] % MOD;
    return dp[n][r] = (rec(n - 1, r - 1) % MOD + rec(n - 1, r) % MOD);
}

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