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();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	}
} 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();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	} 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[] results = {a+b, a-b, a*b}; results {a+b, a-b, a*b} a+b a b a-b a b a*b a b int max = a+b; max a+b a b for(int result : results) {
			max = result > max ? result : max;
		} int result results {
			max = result > max ? result : max;
		} {
			max = result > max ? result : max;
		} max = result > max ? result : max max result > max ? result : max result > max result max result max System.out.println(max) System.out.println System.out System System.out max 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[] results = {a+b, a-b, a*b};

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	}
} 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();

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

		int max = a+b;
		for(int result : results) {
			max = result > max ? result : max;
		}
		System.out.println(max);
	}
}