import java.util.Scanner;

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