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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Linq;

class main {
	public static void Main(string[] args){
    	var input = Console.ReadLine().Split(' ');
      
      	int A = int.Parse(input[0]);
      	op operation = op.plus;
      	if(input[1] == "+")operation = op.plus;
      	else operation = op.minas;
      
      	int B = int.Parse(input[2]);
      
      	if(operation == op.plus)Console.WriteLine(A + B);
      	else Console.WriteLine(A-B);
    }
  
  	enum op{plus,minas,}
}