import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		int x=sc.nextInt();
		int y=sc.nextInt();
		int a,b,c;
		a=x+y;
		b=x-y;
		c=x*y;
		if(a>=b&&a>=c){
			System.out.print(a);
		}else if(b>=a&&b>=c){
			System.out.print(b);	
		}else if(c>=a&&c>=b){
			System.out.print(c);	
		}
	}
}
/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