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.*;

public class Main {
    public static void main(String[] args){
    	Scanner scan = new Scanner(System.in);    	
    	int a = scan.nextInt();
    	int b = scan.nextInt();
    	int ans = a + b;
    	if (ans < (a-b)) ans = a - b;
    	if (ans < (a*b)) ans = a * b;
    	System.out.println(ans);
    }
}