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 ConsoleApplication
{
    public class A
    {
        int a, b;
        string op;
        public A() 
        {
            string[] s = Console.ReadLine().Split(' ');
            this.a = int.Parse(s[0]);
            this.b = int.Parse(s[2]);
            this.op = s[1];
        }

        public void run() 
        {
            if (op == "+") {
                System.Console.WriteLine(a+b);
            } else {
                System.Console.WriteLine(a-b);
            }
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            var a = new A();
            a.run();
        }
    }
}