import java.util.Scanner;

class Main {
  public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();
int b = sc.nextInt();

if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
}

    
  }
} import java.util.Scanner; Scanner java.util class Main {
  public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();
int b = sc.nextInt();

if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
}

    
  }
} Main public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();
int b = sc.nextInt();

if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
}

    
  } main {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();
int b = sc.nextInt();

if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
}

    
  } 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 if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
} a+b >= a-b && a+b >= a*b a+b >= a-b a+b a b a-b a b a+b >= a*b a+b a b a*b a b {
  System.out.println(a+b);
  
} System.out.println(a+b) System.out.println System.out System System.out a+b a b if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
} a-b >= a+b && a-b >= a*b a-b >= a+b a-b a b a+b a b a-b >= a*b a-b a b a*b a b {
  System.out.println(a-b);
} System.out.println(a-b) System.out.println System.out System System.out a-b a b {
  System.out.println(a*b);
} System.out.println(a*b) System.out.println System.out System System.out a*b a b String[] args args
import java.util.Scanner;

class Main {
  public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int a = sc.nextInt();
int b = sc.nextInt();

if(a+b >= a-b && a+b >= a*b){
  System.out.println(a+b);
  
}else if(a-b >= a+b && a-b >= a*b){
  System.out.println(a-b);
}else{
  System.out.println(a*b);
}

    
  }
}
