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.Text;
using System.Threading.Tasks;

namespace ABC050A___Addition_and_Subtraction_Easy
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            string[] fomula = input.Split(' ');

            int num1 = int.Parse(fomula[0]);
            string arithmeticOperator = fomula[1];
            int num2 = int.Parse(fomula[2]);

            int result = 0;
            switch (arithmeticOperator)
            {
                case "+": result = num1 + num2; break;
                case "-": result = num1 - num2; break;

                default: break;
            }

            //DataTable dt = new DataTable();

            //int result = (int)dt.Compute(input, "");


            Console.WriteLine(result);
        }
    }
}