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 -*-

num = raw_input().split()

num[0] = int(num[0])
num[1] = int(num[1])

if num[0]+num[1] > num[0]-num[1]:
    if num[0]+num[1] > num[0]*num[1]:
        print num[0]+num[1]
    else:
        print num[0] * num[1]
else :
        if num[0]-num[1] > num[0]*num[1]:
            print num[0]-num[1]
        else:
            print num[0] * num[1]
