import java.util.*;
 
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    }
} import java.util.*; util.* java public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    }
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    } main {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = Integer.parseInt(sc.next()); a Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int b = Integer.parseInt(sc.next()); b Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc System.out.println(Math.max(Math.max(a+b, a-b), a*b)) System.out.println System.out System System.out Math.max(Math.max(a+b, a-b), a*b) Math.max Math Math.max(a+b, a-b) Math.max Math a+b a b a-b a b a*b a b String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    }
} public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    }
} Main
import java.util.*;
 
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        System.out.println(Math.max(Math.max(a+b, a-b), a*b));
    }
}