using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("5+3");
            //2
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("10-20");
            //30
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("-2+-3");
            //1
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        Match InsMatch = Regex.Match(InputList[0], @"([-+]?[0-9]+)([-+])([-+]?[0-9]+)$");
        int X = int.Parse(InsMatch.Groups[1].Value);
        string Ope = InsMatch.Groups[2].Value;
        int Y = int.Parse(InsMatch.Groups[3].Value);

        if (Ope == "+") Console.WriteLine(X - Y);
        else Console.WriteLine(X + Y);
    }
}