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

namespace foryuki
{
    class Program
    {
        static void Main(string[] args)
        {
            var c = (Console.ReadLine() + '\0').ToCharArray();
            string x = "";
            string y = "";
            bool isPlus1 = true;
            bool isPlus2 = true;
            bool isPlus3 = true;
            int i = 0;

            if (c[i] == '-')
            {
                isPlus1 = false;
                i++;
            }
            else if (c[i] == '+')
            {
                i++;
            }

            while (char.IsNumber(c[i]))
            {
                x += c[i];
                i++;
            }

            if (c[i] == '-' && (c[i + 1] == '+' || c[i + 1] == '-'))
            {
                isPlus2 = false;
                i++;

                if (c[i] == '-')
                {
                    isPlus3 = false;
                }
                i++;
            }
            else if (c[i] == '+' && (c[i + 1] == '+' || c[i + 1] == '-'))
            {
                i++;

                if (c[i] == '-')
                {
                    isPlus3 = false;
                }
                i++;
            }
            else if (c[i] == '+')
            {
                i++;
            }
            else if (c[i] == '-')
            {
                isPlus3 = false;
                i++;
            }

            while (char.IsNumber(c[i]))
            {
                y += c[i];
                i++;
            }

            int a = (isPlus1 ? 1 : -1) * int.Parse(x);
            int b = (isPlus3 ? 1 : -1) * int.Parse(y);

            int ans;
            if (isPlus2)
            {
                ans = a - b;
            }
            else
            {
                ans = a + b;
            }

            Console.WriteLine(ans);
        }

        //-------------------------------------------------------------

        static int[] ConvertStringArrayToIntArray(string[] array)
        {
            return Array.ConvertAll(array, str => int.Parse(str));
        }

        static List<int> ConvertStringArrayToIntList(string[] str)
        {
            var list = new List<int>();
            foreach (var c in str)
            {
                list.Add(int.Parse(c));
            }
            return list;
        }
    }
}