import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner s = new Scanner(System.in);
    int A = s.nextInt();
    int B = s.nextInt();
      if ( A+B >= A-B){
        if (A*B >= A+B){
          System.out.println(A*B);
        }
        if (A*B < A+B){
          System.out.println(A+B);
        }
      }
      if ( A+B < A-B){
        if (A*B >= A-B){
          System.out.println(A*B);
        }
        if (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