import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
}

 import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	} main {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int m = sc.nextInt(); m sc.nextInt() sc.nextInt sc long count=0; count 0 long count1=0; count1 0 int[] array = new int[3]; array new int[3] 3 array[0]=n-m array[0] array 0 n-m n m array[1]=n*m array[1] array 1 n*m n m array[2]=n+m array[2] array 2 n+m n m Arrays.sort(array) Arrays.sort Arrays array System.out.println(array[2]) System.out.println System.out System System.out array[2] array 2 String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
}


