import java.io.BufferedReader;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Collections;
import java.util.Arrays;

public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
} import java.io.BufferedReader; BufferedReader java.io import java.io.*; io.* java import java.util.*; util.* java import java.util.ArrayList; ArrayList java.util import java.util.Iterator; Iterator java.util import java.util.List; List java.util import java.util.Collections; Collections java.util import java.util.Arrays; Arrays java.util public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
} Main public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





} main {
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





} 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 = new ArrayList<>(); list new ArrayList<>() int sum1 = 0; sum1 0 int sum2 = 0; sum2 0 int sum3 = 0; sum3 0 sum1 = a + b sum1 a + b a b sum2 = a - b sum2 a - b a b sum3 = a * b sum3 a * b a b if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    } sum1 >= sum2 && sum1 >= sum3 sum1 >= sum2 sum1 sum2 sum1 >= sum3 sum1 sum3 {
        System.out.println(sum1);
    } System.out.println(sum1) System.out.println System.out System System.out sum1 if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    } sum2 >= sum1 && sum2 >= sum3 sum2 >= sum1 sum2 sum1 sum2 >= sum3 sum2 sum3 {
        System.out.println(sum2);
    } System.out.println(sum2) System.out.println System.out System System.out sum2 {
        System.out.println(sum3);
    } System.out.println(sum3) System.out.println System.out System System.out sum3 final String[] args args public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
} public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
} Main
import java.io.BufferedReader;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Collections;
import java.util.Arrays;

public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
}