import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a =  sc.nextInt();
    int b =  sc.nextInt();
    int answer = 0;
    if(a*b>=(a+b)){
      if(a*b>=(a-b)){
        answer=a*b;
      }else{
        answer=a-b;
      }
    }else{
      if((a+b)>=(a-b)){
        answer = a+b;
      }else{
        answer = a-b;
      }
    }
    System.out.println(answer);
  }
}
/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