import java.util.*;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  }
} import java.util.*; util.* java import java.util.Collections; Collections 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();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  } main {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  } 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 List<Integer> list = Arrays.asList(A + B, A - B, A * B); list Arrays.asList(A + B, A - B, A * B) Arrays.asList Arrays A + B A B A - B A B A * B A B Collections.sort(list, Collections.reverseOrder()) Collections.sort Collections list Collections.reverseOrder() Collections.reverseOrder Collections System.out.println(list.get(0)) System.out.println System.out System System.out list.get(0) list.get list 0 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();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  }
} Main
import java.util.*;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    List<Integer> list = Arrays.asList(A + B, A - B, A * B);
    Collections.sort(list, Collections.reverseOrder());
    System.out.println(list.get(0));
  }
}
