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 OCaml (4.02.3) (judge verdict: Accepted)

let a, op, b = Scanf.scanf "%d %s %d\n" (fun a b c -> a, b, c)
let calc = function
  | "+" -> (+)
  | "-" -> (-)
  | _ -> failwith "hoge"
           
let () =
  let op = calc op in
  print_endline @@ string_of_int (op a b)