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
# coding: utf-8

a,b = map(int,raw_input().split())

c0 = a+b
c1 = a-b
c2 = a*b


if c0 >= c1:
	maxx = c0
else: maxx = c1
if c2 >= maxx:
	maxx = c2
print maxx