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 sc = new Scanner(System.in);
int A=sc.nextInt(),B=sc.nextInt();
int wa=A+B;
int sa=A-B;
int seki=A*B;
int max=0;
if(wa>=seki&&wa>=sa){max=wa;}
if(sa>=wa&&sa>=seki){max=sa;}
if(seki>=wa&&seki>=sa){max=seki;}
System.out.println(max);
}
}