import java.util.Scanner;

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

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int result = a + b;
    if (result < a * b)
      result = a * b;
    if (result < a - b)
      result = a - b;
    System.out.println(result);
  }
}