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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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 long ans = 2018; ans 2018 R = Math.min(R, L + 2019) R Math.min(R, L + 2019) Math.min Math R L + 2019 L 2019 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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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();

		long ans = 2018;

		R = Math.min(R, L + 2019);

		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);
	}


}