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.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		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();
		long R = sc.nextLong();

		if (R - L >= 2019) {
			System.out.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		System.out.println(ans);
	}
} 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.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);

		long L = sc.nextLong();
		long R = sc.nextLong();

		if (R - L >= 2019) {
			System.out.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		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 long R = sc.nextLong(); R sc.nextLong() sc.nextLong sc if (R - L >= 2019) {
			System.out.println(0);
			return;
		} R - L >= 2019 R - L R L 2019 {
			System.out.println(0);
			return;
		} System.out.println(0) System.out.println System.out System System.out 0 return; long ans = Long.MAX_VALUE; ans Long.MAX_VALUE Long Long.MAX_VALUE for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		} long i = L; long i = L; i L i < R i R i++ i++ i {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		} {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		} long tmp =0; tmp 0 for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			} long j = i+1; long j = i+1; j i+1 i 1 j <= R j R j++ j++ j {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			} {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			} tmp=(i*j)%2019 tmp (i*j)%2019 (i*j) i j 2019 ans = Math.min(ans, tmp) ans Math.min(ans, tmp) Math.min Math ans tmp 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();
		long R = sc.nextLong();

		if (R - L >= 2019) {
			System.out.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		System.out.println(ans);
	}
} 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.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		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();
		long R = sc.nextLong();

		if (R - L >= 2019) {
			System.out.println(0);
			return;
		}

		long ans = Long.MAX_VALUE;
		for (long i = L; i < R; i++) {
			long tmp =0;
			for (long j = i+1; j <= R; j++) {
				tmp=(i*j)%2019;
				ans = Math.min(ans, tmp);
			}
		}
		System.out.println(ans);
	}
}
