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();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(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.nextLong();
        long r = sc.nextLong();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long l = sc.nextLong();
        long r = sc.nextLong();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    } main {
        Scanner sc = new Scanner(System.in);
        long l = sc.nextLong();
        long r = sc.nextLong();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    } 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 if (r - l >= 2019) {
            System.out.print(0);
            return;
        } r - l >= 2019 r - l r l 2019 {
            System.out.print(0);
            return;
        } System.out.print(0) System.out.print System.out System System.out 0 return; long min = 2019; min 2019 for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        } long i = l; long i = l; i l i <= r - 1 i r - 1 r 1 i++ i++ i {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        } {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        } for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            } long j = i+1; long j = i+1; j i+1 i 1 j <= r j r j++ j++ j {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            } {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            } long mod = (i * j) % 2019; mod (i * j) % 2019 (i * j) i j 2019 if (min > mod) {
                    min = mod;
                } min > mod min mod {
                    min = mod;
                } min = mod min mod System.out.print(min) System.out.print 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.nextLong();
        long r = sc.nextLong();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long l = sc.nextLong();
        long r = sc.nextLong();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    }
} 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();

        if (r - l >= 2019) {
            System.out.print(0);
            return;
        }

        long min = 2019;
        for (long i = l; i <= r - 1; i++) {
            for (long j = i+1; j <= r; j++) {
                long mod = (i * j) % 2019;
                if (min > mod) {
                    min = mod;
                }
            }
        }
        System.out.print(min);
    }
}