using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        string inpt = Reader.ReadLine();

        string[] splt = DivideKakko(inpt);
        for (int i = 0; i < splt.Length; i++) {
            if(splt[i].Contains('(')) {
                splt[i] = GetCalc(splt[i]).ToString();                
            }
        }
        int ans = GetCalc(string.Join("", splt));
        Console.WriteLine(ans);
    }

    private int GetCalc(string inpt) {
        string src = inpt;
        if(inpt[0] == '(') {
            src = inpt.Substring(1, inpt.Length - 2);
        }
        int ans = 0;
        bool isAdd = true;
        for (int i = 0; i < src.Length; i++) {
            if(src[i] == '-') {
                isAdd = false;                
            } else if(src[i] == '+') {
                isAdd = true;
            } else if(isAdd) {
                ans += src[i] - '0';                
            } else {
                ans -= src[i] - '0';
            }
        }
        return ans;
    }

    private string[] DivideKakko(String inText) {
        List<String> ret = new List<string>();
        if(!inText.Contains(')')) {
            ret.Add(inText);
            return ret.ToArray();
        }

        int stIdx = 0;
        for (int i = 0; i < inText.Length; i++) {
            if(inText[i] == '(' && i>0) {
                ret.Add(inText.Substring(stIdx, i - stIdx));
                stIdx = i;
            } else if(inText[i] == ')') {
                ret.Add(inText.Substring(stIdx, i - stIdx + 1));
                stIdx = i + 1;
            }
        }
        if(stIdx< inText.Length) {
            ret.Add(inText.Substring(stIdx, inText.Length - stIdx));
        }
        return ret.ToArray();
    }

    public class Reader
    {
        static StringReader sr;
        public static bool IsDebug = false;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (sr == null)
                {
                    sr = new StringReader(InputText.Trim());
                }
                return sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        private static string InputText = @"



1-(2-1)+(2+2)-3






";
    }

    public static void Main(string[] args)
    {
#if DEBUG
        Reader.IsDebug = true;
#endif
        Program prg = new Program();
        prg.Proc();
    }
}