
import java.util.Scanner;
public class Main {
	static int mod = 1000000007;
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextInt();
		long m = sc.nextInt();
		long ans = Integer.MAX_VALUE;
		loop:for(long i = n; i <= m; i++) {
			for(long j = i+1; j <= m; j++) {
				ans = Math.min(ans, (i*j)%2019);
				if(ans == 0) {
					break loop;
				}
			}
		}

		System.out.println(ans);
		sc.close();

	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz