Problem:
Score : 100 points

Problem Statement

We have two integers: A and B.

Print the largest number among A + B, A - B, and A \times B.

Constraints

All values in input are integers.

-100 \leq A,\ B \leq 100

Input

Input is given from Standard Input in the following format:

A B

Output

Print the largest number among A + B, A - B, and A \times B.

Sample Input 1

-13 3

Sample Output 1

-10

The largest number among A + B = -10, A - B = -16, and A \times B = -39 is -10.

Sample Input 2

1 -33

Sample Output 2

34

The largest number among A + B = -32, A - B = 34, and A \times B = -33 is 34.

Sample Input 3

13 3

Sample Output 3

39

The largest number among A + B = 16, A - B = 10, and A \times B = 39 is 39.

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

N = gets.to_i
x = []
k = 0
cnt = 0
N.times do
  x[k] = gets.strip.split("")
  k +=1
end
x.each_with_index do |item, i|
  break if i==N
  x.each_with_index do |item, j|
    cnt += 1 if x[i].sort == x[j].sort
  end
end
puts (cnt-N)/2