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.chomp.to_i
s = gets.chomp.split("")
min_count = 3 * 10**5

(n).times do |i|
    count = 0

    s.each_with_index do |str,j|
        if i == j
            next
        elsif i < j
            if str == "E"
                count = count + 1
            end
        else
            if str == "W"
                count = count + 1
            end
        end
    end
    if min_count > count
        min_count = count
    end
    if min_count < n - i
        next
    end
end
puts min_count