import java.util.Scanner;
import java.lang.Math;

public class Main{
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		final int A = scan.nextInt();
		final int B = scan.nextInt();

		System.out.println(Math.max(A+B,Math.max(A-B,A*B)));
	}
} import java.util.Scanner; Scanner java.util import java.lang.Math; Math java.lang public class Main{
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		final int A = scan.nextInt();
		final int 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);
		final int A = scan.nextInt();
		final int B = scan.nextInt();

		System.out.println(Math.max(A+B,Math.max(A-B,A*B)));
	} main {
		Scanner scan = new Scanner(System.in);
		final int A = scan.nextInt();
		final int 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) final int A = scan.nextInt(); A scan.nextInt() scan.nextInt scan final int 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);
		final int A = scan.nextInt();
		final int 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);
		final int A = scan.nextInt();
		final int B = scan.nextInt();

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

public class Main{
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		final int A = scan.nextInt();
		final int B = scan.nextInt();

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