using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //入力
            var input = Console.ReadLine();
            string tempSt = input;
            string tempNum = "";

            while (true)
            {
                //文字列中に（）が有ったらそこを先に計算する
                var start = input.IndexOf("(");
                var end = input.IndexOf(")");
                if (start > -1)
                {
                    //カッコ内を抽出
                    var t = input.Substring(start + 1, ((end - 1) - start));

                    //計算
                    tempNum = Calc.Decision(t);

                    //カッコ部分を置き換え
                    input = input.Replace("(" + t + ")", tempNum);
                    input = Calc.NewMethod(input);
                }
                else
                {
                    break;
                }
            }
            //カッコなしで最後の計算
            input = Calc.NewMethod(input);
            Console.WriteLine(Calc.Decision(input));
            Console.ReadKey();
        }
    }

    class Calc
    {
        public static string Decision(string str)
        {
            var ope = new List<char>();
            var opeSt = new[] {'+','-'};
            var tempNum = Array.ConvertAll(str.Split(opeSt), s => int.Parse(s)).ToList();

            foreach (var st in str)
            {
                if (st == '+' || st == '-') ope.Add(st);
            }
            foreach (var op in ope)
            {
                if (op == '+')
                {
                    tempNum[0] = tempNum[0] + tempNum[1];
                }
                else if (op == '-')
                {
                    var answer = tempNum[0] - tempNum[1];
                    tempNum[0] = answer;
                }
                tempNum.RemoveAt(1);
            }
            return tempNum[0].ToString();
        }

        public static string NewMethod(string input)
        {
            input = input.Replace("++", "+");
            input = input.Replace("--", "+");
            input = input.Replace("+-", "-");
            input = input.Replace("-+", "-");
            return input;
        }
    }
}