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<ios>
int main()
{
	int a,b,x,y,z;
	scanf("%d%d",&a,&b);
	x=a+b;
	y=a-b;
	z=a*b;
	x=x>y?x:y;
	x=x>z?x:z;
	printf("%d",x);
}