import 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 C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A= sc.nextInt();
		int B= sc.nextInt();
		int C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A= sc.nextInt();
		int B= sc.nextInt();
		int C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int A= sc.nextInt();
		int B= sc.nextInt();
		int C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	} 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 C=A+B; C A+B A B int D=A-B; D A-B A B int E=A*B; E A*B A B int ans=0; ans 0 ans=Math.max(E, (Math.max(C, D))) ans Math.max(E, (Math.max(C, D))) Math.max Math E (Math.max(C, D)) Math.max Math C D System.out.println(ans) System.out.println System.out System System.out ans 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 C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A= sc.nextInt();
		int B= sc.nextInt();
		int C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	}
} Main
import 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 C=A+B;
		int D=A-B;
		int E=A*B;
		int ans=0;
		ans=Math.max(E, (Math.max(C, D)));	
	System.out.println(ans);
	}
}