import java.util.*;

public class Main {
  static int[] list;
    public static void main(String[] args) throws Exception{
      Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int x = a + b;
      int y = a - b;
      int z = a * b;
      System.out.println(Math.max(x,Math.max(y,Math.max(z,y))));
      
    }
}
/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