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;

class Atcoder42
{
    public static void Main()
    {
        string[] input = Console.ReadLine().Split(' ');
        int a = int.Parse(input[0]);
        string op = input[1];
        int b = int.Parse(input[2]);

        if (op == "+")
            Console.WriteLine(a + b);
        else
            Console.WriteLine(a - b);
    }
}