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;

namespace B_011_50
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            new Logic_A().Start();
        }

        public class Logic_A
        {
            public void Start()
            {
                var str = Console.ReadLine().Split(' ');
                var a = Convert.ToInt32(str[0]);
                var b = str[1];
                var c = Convert.ToInt32(str[2]);

                Console.WriteLine(b[0] == '+' ? a + c : b[0] == '-' ? a - c : 0);
            }
        }
    }
}