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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;

namespace cswork {
    class Program {
        static void Main (string[] args) {
            List<string> ss =  ReadListStr();
            if(ss[1].Equals("+")){
                Write(int.Parse(ss[0]) + int.Parse(ss[2]));
            }else{
                Write(int.Parse(ss[0]) - int.Parse(ss[2]));
            }
            Exit ();
        }

        public static void Write (string str) {
            Console.WriteLine (str);
        }

        public static void Write (int i) {
            Console.WriteLine (i);
        }

        public static void Write (double d) {
            Console.WriteLine (d);
        }

        public static string ReadStr () {
            return Console.ReadLine ();
        }

        public static int ReadInt () {
            return int.Parse (Console.ReadLine ());
        }

        public static long Read () {
            return long.Parse (Console.ReadLine ());
        }

        public static double ReadDouble () {
            return double.Parse (Console.ReadLine ());
        }

        public static void Exit () { }

        public static List<string> ReadListStr () {
            return new List<string> (ReadStr ().Split (" "));
        }

        public static List<long> ReadList () {
            return ReadListStr ().ConvertAll (x => long.Parse (x));
        }

        public static List<int> ReadListInt () {
            return ReadListStr ().ConvertAll (x => int.Parse (x));
        }
    }
}