import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    }

    static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    }

    static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) C solver = new C(); solver new C() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    } C public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        } solve {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        } int L = Integer.parseInt(in.next()); L Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int R = Integer.parseInt(in.next()); R Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in long ans = Long.MAX_VALUE; ans Long.MAX_VALUE Long Long.MAX_VALUE if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            } R - L + 1 >= 2019 R - L + 1 R - L R L 1 2019 {
                ans = 0;
            } ans = 0 ans 0 {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            } for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                } int i = L; int i = L; i L i <= R i R i++ i++ i {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                } {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                } for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    } int j = i + 1; int j = i + 1; j i + 1 i 1 j <= R j R j++ j++ j {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    } {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    } ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans) ans Math.min(((i % 2019) * (j % 2019)) % 2019, ans) Math.min Math ((i % 2019) * (j % 2019)) % 2019 ((i % 2019) * (j % 2019)) (i % 2019) i 2019 (j % 2019) j 2019 2019 ans if (ans == 0) break; ans == 0 ans 0 break; out.println(ans) out.println out ans int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    }

    static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    }

    static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        C solver = new C();
        solver.solve(1, in, out);
        out.close();
    }

    static class C {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int L = Integer.parseInt(in.next());
            int R = Integer.parseInt(in.next());
            long ans = Long.MAX_VALUE;

            if (R - L + 1 >= 2019) {
                ans = 0;
            } else {

                for (int i = L; i <= R; i++) {
                    for (int j = i + 1; j <= R; j++) {
                        ans = Math.min(((i % 2019) * (j % 2019)) % 2019, ans);
                        if (ans == 0) break;
                    }
                }
            }

            // 出力
            out.println(ans);

        }

    }
}

