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 (2.3.3) (judge verdict: Runtime Error)

# quest_num = gets.chomp.to_i
seconds = gets.chomp.split(' ')
# drink_num = gets.chomp.to_i
(0..drink_num-1).each do
  sum = 0
  drink = gets.chomp.split(' ')
  seconds.each_with_index do |s, j|
    sum += s.to_i if j != drink[0].to_i-1
    sum += drink[1].to_i if j == drink[0].to_i-1
  end
  puts sum
end