Problem:
Score : 100 points

Problem Statement

Joisino wants to evaluate the formula "A op B".
Here, A and B are integers, and the binary operator op is either + or -.
Your task is to evaluate the formula instead of her.

Constraints

1≦A,B≦10^9

op is either + or -.

Input

The input is given from Standard Input in the following format:

A op B

Output

Evaluate the formula and print the result.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

Solution in Ruby (2.7.1) (judge verdict: Accepted)

class Problem
  attr_accessor :a, :b, :n, :m, :h, :w

  def initialize
    @a,@op,@b = gets.to_s.split
  end

  def solve
    if @op == "+"
      @a.to_i + @b.to_i
    else
      @a.to_i - @b.to_i
    end
  end

  def show(ans)
    puts ans
  end
end

Problem.new.instance_eval do
  show(solve)
end