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
S = gets.chomp.split("")
max = 0

for i in 0..N-1
  kind = (S.slice(0..i) & S.slice(i+1..N-1)).length
  if max < kind then
    max = kind
  end
end

puts max