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.*;
class Main{
    public static void main(String[] args){
	Scanner stdIn=new Scanner(System.in);
	int A = stdIn.nextInt();
	int B = stdIn.nextInt();
	int[] ans=new int[3];
	ans[0]=A+B;
	ans[1]=A-B;
	ans[2]=A*B;
	Arrays.sort(ans);
	System.out.println(ans[2]);
    }
}
