import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int A = Integer.parseInt(sc.next());
		int B = Integer.parseInt(sc.next());
//		String s = sc.next();

		List<Integer> list = new ArrayList();

		list.add(A+B);
		list.add(A-B);
		list.add(A*B);

		Collections.sort(list);
		Collections.reverse(list);

		System.out.println(list.get(0));


	}

}


/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