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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace testAtCorder
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] t = new int[n];
            string[] str = Console.ReadLine().Split();
            for (int i = 0; i < n; i++)
            {
                t[i] = int.Parse(str[i]);
            }
            int m = int.Parse(Console.ReadLine());
            int[] p = new int[m];
            int[] x = new int[m];
            string[] mtemp;
            for (int i = 0; i < m; i++)
            {
                mtemp = Console.ReadLine().Split();
                p[i] = int.Parse(mtemp[0]);
                x[i] = int.Parse(mtemp[1]);
                //
            }
            var ans = 0;
            for (int i = 0; i < n; i++)
            {
                ans += t[i];
            }
            for (int i = 0; i < m; i++) {
                var temp = (t[p[i]-1] - x[i]);
                if (t[p[i]-1] > x[i])
                {
                    Console.WriteLine(ans - temp);
                }
                else if (t[p[i]-1] < x[i]) Console.WriteLine(ans + Math.Abs(temp));
                else Console.WriteLine(ans);
                
            }
            

            Console.ReadKey();
        }
    }
}