import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	}
} Main public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	} main {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) long A = scan.nextInt(); A scan.nextInt() scan.nextInt scan long B = scan.nextInt(); B scan.nextInt() scan.nextInt scan System.out.println(Math.max(A*B,  Math.max(A - B, A + B))) System.out.println System.out System System.out Math.max(A*B,  Math.max(A - B, A + B)) Math.max Math A*B A B Math.max(A - B, A + B) Math.max Math A - B A B A + B A B String[] args args public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	}
} public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long A = scan.nextInt();
		long B = scan.nextInt();

		System.out.println(Math.max(A*B,  Math.max(A - B, A + B)));
	}
}