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();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	}

} 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();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();
		int B = sc.nextInt();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	} main {

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();
		int B = sc.nextInt();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	} 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 if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		} A+B > A-B && A+B > A*B A+B > A-B A+B A B A-B A B A+B > A*B A+B A B A*B A B {
			System.out.println(A+B);
		} System.out.println(A+B) System.out.println System.out System System.out A+B A B if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		} A*B > A-B && A*B > A+B A*B > A-B A*B A B A-B A B A*B > A+B A*B A B A+B A B {
			System.out.println(A*B);
		} System.out.println(A*B) System.out.println System.out System System.out A*B A B {
			System.out.println(A-B);
		} System.out.println(A-B) System.out.println System.out System System.out A-B A B 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();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();
		int B = sc.nextInt();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	}

} 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();

		if (A+B > A-B && A+B > A*B) {
			System.out.println(A+B);
		} else if (A*B > A-B && A*B > A+B) {
			System.out.println(A*B);
		} else {
			System.out.println(A-B);
		}


	}

}