import java.util.*;
public class Main {
public static void main(String[] args) {
	Scanner re=new Scanner(System.in);
		int A1=re.nextInt();
		int B1=re.nextInt();
		System.out.println(Math.max(Math.max((A1+B1), (A1-B1)), (A1*B1)));
}
}
/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