using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string inpt = Reader.ReadLine();
        
        int x = 0;
        int y = 0;
        char op = ' ';
        for(int i=0; i<inpt.Length; i++) {
            if(i > 0 && IsNum(inpt[i-1]) && (!IsNum(inpt[i]))) {
                string xStr = inpt.Substring(0, i).Trim('+');
                string yStr = inpt.Substring(i+1).Trim('+');
                x = int.Parse(xStr);
                y = int.Parse(yStr);
                op = inpt[i];
                break;
            }
        }
        int ans = x;
        if(op == '+') {
            ans -= y;
        } else
        {
            ans += y;
        }
        Console.WriteLine(ans);

    }
    
    private bool IsNum(char inpt) {
        return inpt >= '0' && inpt <= '9';
    }
    
    



    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


-2+-3


 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}