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

const ll MOD = 1e9;
int gcd(int a, int b){
    if(b == 0)
        return a;
    
    return gcd(b, a % b);
}

int main(){
    ll N, M;
    cin >> N >> M;
    
    N /= 1000;
    N %= M;
    
    vector<int> num(N), den(N);
    for(int i=0;i<N;i++)num[i] = M - i;
    for(int i=0;i<N;i++)den[i] = i + 1;
    
    for(int i=0;i<N;i++){
        for(int j=0;j<N;j++){
            int g = gcd(num[i], den[j]);
            num[i] /= g;
            den[j] /= g;
        }
    }
    
    ll res = 1;
    for(int i=0;i<N;i++)
        res = (res * num[i]) % MOD;
    
    cout << res << endl;
    return 0;
}