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: Runtime Error)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class A
{
    public static void Main()
    {
        var a = int.Parse(Console.ReadLine());
        var op = char.Parse(Console.ReadLine());
        var b = int.Parse(Console.ReadLine());
        
        switch (op)
        {
            case '+':
                Console.WriteLine(a+b);
                break;
            case '-':
                Console.WriteLine(a-b);
                break;
            default:
                break;
        }
    }
}