import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in); scanner new Scanner(System.in) long L = scanner.nextInt(); L scanner.nextInt() scanner.nextInt scanner long R = scanner.nextInt(); R scanner.nextInt() scanner.nextInt scanner scanner.close() scanner.close scanner R = Math.min(R, L + 4038) R Math.min(R, L + 4038) Math.min Math R L + 4038 L 4038 long ans = 2018; ans 2018 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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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 scanner = new Scanner(System.in);
        long L = scanner.nextInt();
        long R = scanner.nextInt();
        scanner.close();

        R = Math.min(R, L + 4038);

        long ans = 2018;
        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);
    }
}