using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string input = Reader.ReadLine();
        long ans = this.GetAns(input);
        for(int i=1; i<input.Length; i++) {
            string newSusiki = input.Substring(i) + input.Substring(0, i);
            if(newSusiki.StartsWith("+") || newSusiki.StartsWith("-") || newSusiki.EndsWith("+") || newSusiki.EndsWith("-")) {
                continue;
            }
            ans = Math.Max(ans, this.GetAns(newSusiki));
        }
        Console.WriteLine(ans);
    }
    
    private long GetAns(string susiki) {
        int idx = 0;
        long ans = 0;
        char prevKigou = '+';
        for(int i=0; i<susiki.Length; i++) {
            if(susiki[i] == '+' || susiki[i] == '-' || i == susiki.Length - 1) {
                int len = i - idx;
                if(i == susiki.Length - 1) {
                    len++;
                }
                int val = int.Parse(susiki.Substring(idx, len));
                if(prevKigou == '+') {
                    ans += val;
                } else
                {
                    ans -= val;
                }
                if(i < susiki.Length - 1) {
                    prevKigou = susiki[i];
                }
                idx = i + 1;
            }
        }
        return ans;
    }



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


10+4-1+15


 
";
        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();
    }
}