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 Program {
  static void Main(string[] args) {
    string[] str = Console.ReadLine().Split(' ');
    int A = int.Parse(str[0]);
    int B = int.Parse(str[2]);
    switch(str[1][0]) {
    case '+':
      Console.WriteLine("{0}", A + B);
      break;
    case '-':
      Console.WriteLine("{0}", A - B);
      break;
    }
  }
}