import java.util.Arrays;
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[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	}
} import java.util.Arrays; Arrays java.util 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[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

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

		int[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	} main {
		Scanner sc = new Scanner(System.in);

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

		int[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	} 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[] c = {a + b, a - b, a * b}; c {a + b, a - b, a * b} a + b a b a - b a b a * b a b Arrays.sort(c) Arrays.sort Arrays c System.out.println(c[2]) System.out.println System.out System System.out c[2] c 2 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[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

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

		int[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	}
} Main
import java.util.Arrays;
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[] c = {a + b, a - b, a * b};

		Arrays.sort(c);

		System.out.println(c[2]);
	}
}