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.Scanner;
import java.util.stream.IntStream;

public class Main {

    public static void main(String[] args) {
        int a, b;
        try (Scanner cin = new Scanner(System.in)) {
            a = cin.nextInt();
            b = cin.nextInt();
        }
        System.out.println(IntStream.of(a + b, a - b, a * b).max().orElse(0));
    }
}
