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