using System.Collections.Generic;
using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var ans = getAns(s);
        Console.WriteLine(ans);

    }
    public static int getAns(string s)
    {
        var s2 = "";
        var p = "";
        var padd = false;
        for (int i = 0; i < s.Length; i++)
        {
            if (padd) 
            {
                if (s[i] == ')')
                {
                    s2 += calc(p).ToString();
                    padd = false;
                    p = "";
                }
                else p += s[i];
            }
            else
            {
                if (s[i] == '(') padd = true;
                else s2 += s[i];
            }
        }
        return calc(s2);
    }
    public static int calc(string s)
    {
        string[] line = s.Split('+', '-');
        var a = Array.ConvertAll(line, int.Parse);
        var aL = a.Length;
        if (aL == 1) return a[0];
        var b = new List<int>();
        for (int i = 0; i < s.Length; i++)
            if (s[i] == '+') b.Add(1);
            else if (s[i] == '-') b.Add(0);
        int ans;
        if (b[0] == 1) ans = a[0] + a[1];
        else ans = a[0] - a[1];
        if (aL == 2) return ans;
        for (int i = 2; i < aL; i++)
            if (b[i - 1] == 1) ans += a[i];
            else ans -= a[i];
        return ans;
    }
}