import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int l=sc.nextInt();
    int r=sc.nextInt();
    int min = 2019*2019;
    for(int i=l;i<=r&&i<=l+2019;i++){
        for(int j=i+1;j<=r&&j<=i+2019;j++){
            min=Math.min( ( ((i%2019)*(j%2019))%2019 ) ,min);
        }
    }
    System.out.println( min );
  }
}

/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