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.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		try (Scanner in = new Scanner(System.in)) {
			int A = in.nextInt();
			int B = in.nextInt();

			int[] a = new int[] { A + B, A - B, A * B, };
			Arrays.sort(a);

			System.out.println(a[2]);
		}
	}
}
