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 {

	static void solve() {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		System.out.println(Math.max(A+B, Math.max(A-B, A*B)));
		sc.close();			
	}

	public static void main(String args[]) {
		solve();
	}

}