import java.util.Scanner;

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