import 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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            }
            System.out.println(min);
        }
    }
} import java.util.*; util.* java 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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                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 if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            }
            System.out.println(min);
        } l - r > 2018 l - r l r 2018 {
            System.out.println(0);
        } 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++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            }
            System.out.println(min);
        } for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                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 (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            } {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            } for (long j = i + 1; j <= r; j++) {
                    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 (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                } {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (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 min i * j % 2019 i * j i j 2019 if (min == 0)
                        break; min == 0 min 0 break; 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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            }
            System.out.println(min);
        }
    }
} Main
import 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;
        if (l - r > 2018) {
            System.out.println(0);
        } else {
            for (long i = l; i < r; i++) {
                for (long j = i + 1; j <= r; j++) {
                    if (i * j % 2019 < min) {
                        min = i * j % 2019;
                    }
                    if (min == 0)
                        break;
                }
                if (min == 0)
                    break;
            }
            System.out.println(min);
        }
    }
}