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();
 
        int c = a + b;
        int d = a - b;
        int e = a * b;
 
        if(c > d){
            if(c > e){
                System.out.print(c);
                System.exit(0);
            }
            System.out.print(e);
            System.exit(0);
        }
 		if(d > e){
        	System.out.print(d);
          	System.exit(0);
        }
      	System.out.print(e);
    }
}
/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