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 Template
{
    public static class Scan
    {
        public static string NextLine => Console.ReadLine();
        public static int NextInt => int.Parse(NextLine);
        public static long NextLong => long.Parse(NextLine);
        public static double NextDouble => double.Parse(NextLine);
 
        public static string[] StrAry(char separator = ' ') => Console.ReadLine().Split(separator);
        public static int[] IntAry(char separator = ' ') => Array.ConvertAll(StrAry(separator), int.Parse);
        public static long[] LongAry(char separator = ' ') => Array.ConvertAll(StrAry(separator), long.Parse);
        public static double[] DoubleAry(char separator = ' ') => Array.ConvertAll(StrAry(separator), double.Parse);
    }
 
    internal class Template
    {
        public static void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
        private static void Fill<T>(T[] src, T value, int len) { for (int i = 0; i < len; i++) { src[i] = value; } }
 
        static void Solve() 
        {            
            var str = Scan.StrAry();
            int A = int.Parse(str[0]), B = int.Parse(str[2]);
            if (str[1][0] == '+')
            {
                Console.WriteLine(A + B);
            }else
            {
                Console.WriteLine(A - B);
            }
        }
        private static void Main()
        {
            Console.SetOut(new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
            Solve();
            Console.Out.Flush();
        }
    }
}