import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int a=stdIn.nextInt();
		int b=stdIn.nextInt();

		int c=a+b;
		int d=a-b;
		int e=a*b;

		int max=c;
		if(max<d) {
			max=d;
		}
		if(max<e){
			max=e;
		}
		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