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.Generic;
using System.Linq;
using System.IO;
using System.Text;
using System.Diagnostics;
using static System.Console;
using static System.Math;


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

        }

    }
}