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();
        sc.close();
        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 public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        sc.close();
        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();
        sc.close();
        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();
        sc.close();
        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 sc.close() sc.close 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 public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        sc.close();
        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);
        }
    }
} public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        sc.close();
        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
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();
        sc.close();
        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);
        }
    }
}