import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    System.out.println(min);
  }
}
 import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    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(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    System.out.println(min);
  } main {
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    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 long min = 2019; min 2019 if(R-L>=2018){
      System.out.println(0);
      return;
    } R-L>=2018 R-L R L 2018 {
      System.out.println(0);
      return;
    } System.out.println(0) System.out.println System.out System System.out 0 return; for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    } long i=L; long i=L; i L i<R i R i++ i++ i {
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    } {
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    } for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     } long j=i+1; long j=i+1; j i+1 i 1 j<=R j R j++ j++ j {
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     } {
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     } min = Math.min((i*j)%2019, min) min Math.min((i*j)%2019, min) Math.min Math (i*j)%2019 (i*j) i j 2019 min System.out.println(min) System.out.println System.out System System.out min String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    System.out.println(min);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    System.out.println(min);
  }
} Main
import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long L = sc.nextLong(); 
    long R = sc.nextLong(); 

    long min = 2019;
    if(R-L>=2018){
      System.out.println(0);
      return;
    }
    for(long i=L; i<R;i++){
      // System.out.println(i);
      for(long j=i+1; j<=R;j++){
        // System.out.println(i+"aaa");
        min = Math.min((i*j)%2019, min);
     }
    }
    System.out.println(min);
  }
}

