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: Runtime Error)

using System;
using System.Linq;

namespace AtCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int[] aa = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int z = int.Parse(Console.ReadLine());
            int suuti = 0;
            for (int i = 0; i < z; i++)
            {
                string[] g = Console.ReadLine().Split().ToArray();
                for (int s = 0; s < a; s++)
                {
                    if (g[i] == null)
                    {
                        suuti += aa[i];
                    }
                    else
                    {
                        int h = int.Parse(g[i]);
                        suuti += h;
                    }
                }
                Console.WriteLine(suuti);
            }
        }
    }
}