import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int l = sc.nextInt();
        int r = sc.nextInt();
        int min = Integer.MAX_VALUE;
        for (int i = l; i < r && i < l + 2019; i++) {
            for (int j = i + 1; j <= r && j < l + 2019; j++) {
                int mi = i % 2019;
                int mj = j % 2019;
                int mm = (mi * mj) % 2019;
                if (mm < min) {
                    min = mm;
                }
            }
        }
        System.out.println(min);
    }
}

/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