You are given two integers A and B. Find the largest value among A+B, A-B and A \times B.

Constraints

* -1000 \leq A,B \leq 1000
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


A B


Output

Print the largest value among A+B, A-B and A \times B.

Examples

Input

3 1


Output

4


Input

4 -2


Output

6


Input

0 0


Output

0
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc1 = new Scanner(System.in);

		int a = sc1.nextInt();
		int b = sc1.nextInt();

		int max = a + b;

		if(a-b > max) {
			max = a - b;
		}

		if ( a*b > max ){
			max = a * b;
		}

		System.out.println(max);

		sc1.close();
	}

}