import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long l = sc.nextLong();
    long r = sc.nextLong();
    
    r   = Math.min(r, l+2019);
    long min = 2018;
    for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019);
    System.out.println(min); 
  }
} import java.util.Scanner; Scanner java.util class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long l = sc.nextLong();
    long r = sc.nextLong();
    
    r   = Math.min(r, l+2019);
    long min = 2018;
    for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019);
    System.out.println(min); 
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long l = sc.nextLong();
    long r = sc.nextLong();
    
    r   = Math.min(r, l+2019);
    long min = 2018;
    for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019);
    System.out.println(min); 
  } main {
    Scanner sc = new Scanner(System.in);
    long l = sc.nextLong();
    long r = sc.nextLong();
    
    r   = Math.min(r, l+2019);
    long min = 2018;
    for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019);
    System.out.println(min); 
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long l = sc.nextLong(); l sc.nextLong() sc.nextLong sc long r = sc.nextLong(); r sc.nextLong() sc.nextLong sc r   = Math.min(r, l+2019) r Math.min(r, l+2019) Math.min Math r l+2019 l 2019 long min = 2018; min 2018 for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019); long i = l; long i = l; i l i <= r i r i++ i++ i for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019); for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019); long j = i+1; long j = i+1; j i+1 i 1 j <= r j r j++ j++ j min = Math.min(min, i*j%2019); min = Math.min(min, i*j%2019) min Math.min(min, i*j%2019) Math.min Math min i*j%2019 i*j i j 2019 System.out.println(min) System.out.println System.out System System.out min String[] args args
import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long l = sc.nextLong();
    long r = sc.nextLong();
    
    r   = Math.min(r, l+2019);
    long min = 2018;
    for(long i = l; i <= r; i++)
      for(long j = i+1; j <= r; j++)
          min = Math.min(min, i*j%2019);
    System.out.println(min); 
  }
}