import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int A = scan.nextInt();
		int B = scan.nextInt();
		scan.close();

		int sum = A + B;
		int hiku = A - B;
		int kakeru = A * B;

		int max = sum;

		if (hiku > max) {
			max = hiku;
		}

		if (kakeru > max) {
			max = kakeru;
		}

		System.out.println(max);

	}

}

/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