import java.util.Scanner;

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

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long l = sc.nextLong();
        long r = sc.nextLong();
        if(r - l >= 2019){
            System.out.println(0);
            return;
        }
        long ans = Long.MAX_VALUE;
        for(long i = l; i < r; i++){
            for(long j = i + 1; j <= r; j++){
                ans = Math.min(ans,(i * j) % 2019);
            }
        }
        System.out.println(ans);
    }
}