import java.util.Scanner;
//import java.util.Arrays;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		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 max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		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 max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		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 max = a + b; max a + b a b if(a - b > max){max = a - b;} a - b > max a - b a b max {max = a - b;} max = a - b max a - b a b if(a * b > max){max = a * b;} a * b > max a * b a b max {max = a * b;} max = a * b max a * b a b 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 max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		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 max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		System.out.println(max);
	}
} Main
import java.util.Scanner;
//import java.util.Arrays;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int max = a + b;
		if(a - b > max){max = a - b;}
		if(a * b > max){max = a * b;}
		System.out.println(max);
	}
}
