Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

3 1

Sample Output 1

4

3+1=4, 3-1=2 and 3 \times 1=3. The largest among them is 4.

Sample Input 2

4 -2

Sample Output 2

6

The largest is 4 - (-2) = 6.

Sample Input 3

0 0

Sample Output 3

0

Solution in Ruby (2.3.3) (judge verdict: Runtime Error)

N = gets.to_i
num = gets.split.map(&:to_i)
count = N

0.upto(num.count-2) do |i|
  sum = num[i]
  xor_sum = num[i]
  (i+1).upto(num.count-1) do |j|
    sum += num[j]
    xor_sum ^= num[j]
    count += 1 if sum == xor_sum
  end
end

puts count