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;

namespace ABC050
{
	class Q1
	{
		static void Main()
		{
			string[] buff = Console.ReadLine().Split(' ');
			int a = int.Parse(buff[0]);
			int b = int.Parse(buff[2]);
			string op = buff[1];
			switch (op)
			{
				case "+":
					Console.WriteLine(a + b);
					break;
				case "-":
					Console.WriteLine(a - b);
					break;
			}
		}
	}
}