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 = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      }
      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 = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;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();
      long min = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;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();
      long min = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;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 long min = 10000; min 10000 if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      } r-l >= 2019 r-l r l 2019 {
        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-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      } for(long i = l;i <= r-1;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-1 i r-1 r 1 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);
            }
        } 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) 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 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 = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      }
      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 = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      }
      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 = 10000;
      if(r-l >= 2019){
        System.out.println(0);
        return;
      }
      else{
      	for(long i = l;i <= r-1;i++){
        	for(long j = i+1;j <= r;j++){
            	min = Math.min(min,(i*j)%2019);
            }
        }
      }
      System.out.println(min);
	}
} 
