using System;
using System.Text.RegularExpressions;
namespace y
{
    class Program
    {
        static void Main(string[] args)
        {
            var s = Console.ReadLine();
            int a = 0;
            while (!int.TryParse(s, out a))
            {
                s = Ca(s);
            }

            Console.WriteLine(a);
        }

        static string Ca(string s)
        {
            string a = Regex.Match(s, @"\(.*?\)").Value;
            if (a.Length == 0) a = s;

            int r = 0;
            bool isMinus = false;
            for (int j = 0; j < a.Length; j++)
            {
                if (a[j] == '-')
                {
                    isMinus = true;
                    continue;
                }

                if (a[j] >= '0' && a[j] <= '9')
                {
                    if (!isMinus)
                    {
                        r += int.Parse(a[j].ToString());
                    }
                    else
                    {
                        r -= int.Parse(a[j].ToString());
                        isMinus = false;
                    }
                }
            }
            return s.Replace(a, r.ToString());
        }
    }
}