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)

_n = gets.chomp.to_i
t = gets.chomp.split.map(&:to_i)
m = gets.chomp.to_i
px = []
m.times do
  px << gets.chomp.split.map(&:to_i)
end
d = t.sum
px.each do |p, x|
  puts (d - t[p - 1] + x).to_s
end