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.Linq;
using System.Collections;
using System.Collections.Generic;
using static System.Console;
class Program
{
    static void Main()
    {
        //入力
        //int n = 100;
        /*
        long n = long.Parse(Console.ReadLine());
        long[] input = new long[5];
        for(int a = 0; a < 5; a++)
        {
            input[a]=long.Parse(Console.ReadLine());
        }
        */
        string[] input = Console.ReadLine().Split().Select(i => (i)).ToArray();

        Console.WriteLine(input[1]=="-"?int.Parse(input[0])-int.Parse(input[2]):int.Parse(input[0])+int.Parse(input[2]));

        /*
        //処理速度計測
        var sw = new System.Diagnostics.Stopwatch();
        sw.Start();
        //解法

        //処理速度表示
        sw.Stop();
        TimeSpan ts = sw.Elapsed;
        Console.WriteLine((int)(Math.Floor((ts).TotalMilliseconds))+"ms");
        */
        Console.ReadLine();
        
    }
}