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 static System.Console;
using static System.Math;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AtCoder
{   
    class Template
    {
        static void Main(string[] args)
        {
            var data = IO.ReadStrArr();
            if (data[1] == "+") WriteLine(int.Parse(data[0]) + int.Parse(data[2]));
            else WriteLine(int.Parse(data[0]) - int.Parse(data[2]));
        }
    }

    public class IO
    {
        public static string ReadStr() => Console.ReadLine();
        public static string[] ReadStrArr() => ReadStr().Split(' ');
        public static int ReadInt() => int.Parse(ReadStr());
        public static int[] ReadIntArr() => Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);
        public static double ReadDouble() => double.Parse(ReadStr());
        public static double[] ReadDoubleArr() => Array.ConvertAll(Console.ReadLine().Split(' '), double.Parse);
        public static long ReadLong() => long.Parse(ReadStr());
        public static long[] ReadLongArr() => Array.ConvertAll(Console.ReadLine().Split(' '), long.Parse);
    }
}