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 plus = A+B;
    int minus = A-B;
    int kakeru = A*B;
    
    if(B>-B){
      if(plus<kakeru)
        System.out.println(kakeru);
      else
        System.out.println(plus);
    }else{
      if(minus<kakeru)
        System.out.println(kakeru);
      else
        System.out.println(minus);
      
    } 
  }
}
/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