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[] アーグス) {
        Scanner スキャナー=new Scanner(System.in);
        int えー=スキャナー.nextInt();
        int びー=スキャナー.nextInt();
        System.out.println(まっくす(まっくす(えー+びー,えー-びー),えー*びー));
    }
    public static int まっくす(int えー, int びー){
        return Math.max(えー,びー);
    }
}
