import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long l = sc.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	}
} 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.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	}
} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long l = sc.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	} main {

		Scanner sc = new Scanner(System.in);
		long l = sc.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long l = sc.nextInt(); l sc.nextInt() sc.nextInt sc long r = sc.nextInt(); r sc.nextInt() sc.nextInt sc long min = 2018; min 2018 for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		} long i = l; long i = l; i l i < r i r i++ i++ i {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		} {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		} for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			} long j = i + 1; long j = i + 1; j i + 1 i 1 j <= r j r j++ j++ j {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			} {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			} if (min == 0)
					break; min == 0 min 0 break; if (i * j % 2019 < min)
					min = i * j % 2019; i * j % 2019 < min i * j % 2019 i * j i j 2019 min min = i * j % 2019 min i * j % 2019 i * j i j 2019 if (min == 0)
					break; min == 0 min 0 break; 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.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	}
} public class Main {
	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long l = sc.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		long l = sc.nextInt();
		long r = sc.nextInt();
		long min = 2018;
		for (long i = l; i < r; i++) {

			for (long j = i + 1; j <= r; j++) {
				if (min == 0)
					break;
				if (i * j % 2019 < min)
					min = i * j % 2019;
				if (min == 0)
					break;
			}
		}

		System.out.println(min);
	}
}
