import java.util.*;

class Main{

    public static void main(String[] args){

	Scanner sc = new Scanner(System.in);

	int A = sc.nextInt();

	int B = sc.nextInt();

	if((A-B)>=(A*B) && (A-B)>=(A+B)){

	System.out.println(A-B);	

  }

	else if((A*B)>=(A-B) && (A*B)>=(A+B)){

	System.out.println(A*B);	

  }	

	else if((A+B)>=(A-B) && (A+B)>=(A*B)){

	System.out.println(A+B);	

  }

 }
}
/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