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();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	}

} 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();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		sc.close();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		sc.close();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	} 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 int a = A+B; a A+B A B int b = A-B; b A-B A B int c = A*B; c A*B A B if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		} a >=b && a >= c a >=b a b a >= c a c {
			System.out.println(a);
		} System.out.println(a) System.out.println System.out System System.out a if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		} b>=c b c {
			System.out.println(b);
		} System.out.println(b) System.out.println System.out System System.out b {
			System.out.println(c);
		} System.out.println(c) System.out.println System.out System System.out c 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();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	}

} 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();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	}

} 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();
		int a = A+B;
		int b = A-B;
		int c = A*B;
		if(a >=b && a >= c) {
			System.out.println(a);
		}else if(b>=c) {
			System.out.println(b);
		}else {
			System.out.println(c);
		}
	}

}