using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro
{

    static void Main()
    {
        string S = Console.ReadLine();
        T? t=null;
        string SS = "";
        int a=0, b=0;
        for(int i = 0; i < S.Length; i++)
        {
            if (S[i] == '-')
            {
                if (i != 0)
                {
                    if (t == null)
                    {
                        t = T.minus;
                        a = int.Parse(SS);
                        SS = "";
                        continue;
                       
                    }
                }
            }
            else if (S[i] == '+')
            {
                if (i != 0)
                {
                    if (t == null)
                    {
                        t = T.plus;
                        a = int.Parse(SS);
                        SS = "";
                        continue;
                    }
                }
            }
            SS += S[i];
        }
        b = int.Parse(SS);
        Console.WriteLine(t == T.plus ? a - b : a + b);
    }
}
enum T
{
    plus,minus
}