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)

// This file is a "Hello, world!" in C# language by Mono for wandbox.
using System;

namespace Wandbox
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] str = Console.ReadLine().Split(' ');
            int a = int.Parse(str[0]);
            int b = int.Parse(str[2]);
            if(str[1] == "+")
                Console.WriteLine(a + b);
            else
                Console.WriteLine(a - b);
        }
    }
}

// Mono references:
//   http://www.mono-project.com/

// C# language references:
//   https://msdn.microsoft.com/library/618ayhy6.aspx