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;


class Program
{
    static void Main()
    {
        string arg = Console.ReadLine();
        string[] args = arg.Split(' ');

        int A = int.Parse(args[0]);
        string op = args[1];
        int B = int.Parse(args[2]);
        int Ans = 0;

        if (op.Equals("+"))
        {
            Ans = A + B;
        }
        else
        {
            Ans = A - B;
        }

        Console.WriteLine(Ans);
    }
}