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{
     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