import java.util.*;
class Main{
    public static void main(String argv[]) {
        Scanner sc = new Scanner(System.in);
        int mod = 2019;
        int L = sc.nextInt();
        int R = sc.nextInt();
        int l = L%mod;
        int r = R%mod;
        int result = 2019;
        if(R-L>=mod){
            System.out.println(0);
            return;
        }
        if(l>r){
            System.out.println(0);
            return;
        }
        for(int i=l;i<=r;i++){
            for(int j=i+1;j<=r;j++){
                result = Math.min((i*j)%mod, result);
            }
        }
        result = result%mod;
        System.out.println(result);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz