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();

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			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();

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			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();

		final int divide = 2019;
		long ans =1000000000;

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

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			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 final int divide = 2019; divide 2019 long ans =1000000000; ans 1000000000 if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			System.out.println(ans);
		} R - L >= 2019 R - L R L 2019 System.out.println(0) System.out.println System.out System System.out 0 {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			System.out.println(ans);
		} for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			} 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)%divide);
				}
			} {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			} for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				} 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)%divide);
				} {
					ans = Math.min(ans, (i*j)%divide);
				} ans = Math.min(ans, (i*j)%divide) ans Math.min(ans, (i*j)%divide) Math.min Math ans (i*j)%divide (i*j) i j divide 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();

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			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();

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			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();

		final int divide = 2019;
		long ans =1000000000;

		if(R - L >= 2019)System.out.println(0);
		else {
			for(long i=L; i<R; i++) {
				for(long j =i+1; j<=R; j++) {
					ans = Math.min(ans, (i*j)%divide);
				}
			}
			System.out.println(ans);
		}
	}

}
