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 ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  }
} 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 ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int A = sc.nextInt();
    int B = sc.nextInt();

    int ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);

    int A = sc.nextInt();
    int B = sc.nextInt();

    int ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  } 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 ans = A + B; ans A + B A B ans = ans < A - B? A - B: ans ans ans < A - B? A - B: ans ans < A - B ans A - B A B A - B A B ans ans = ans < A * B? A * B: ans ans ans < A * B? A * B: ans ans < A * B ans A * B A B A * B A B ans System.out.println(ans) System.out.println System.out System System.out ans 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 ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  }
} public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int A = sc.nextInt();
    int B = sc.nextInt();

    int ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  }
} 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 ans = A + B;
    ans = ans < A - B? A - B: ans;
    ans = ans < A * B? A * B: ans;

    System.out.println(ans);
  }
}
