class Program
    {
        static void Main(string[] args)
        {
            char[] mark = { '+', '-' };
            string formulaStr = Console.ReadLine();
            int plusIndex = formulaStr.IndexOf(mark[0]);
            int minusIndex = formulaStr.IndexOf(mark[1]);
            char symbol ;
            int indexNumber = 0;
            if(minusIndex <= 0  && plusIndex > 0 || minusIndex > 0 && plusIndex > 0 && plusIndex < minusIndex)
            {
                symbol = '+';
                indexNumber = plusIndex;
            }
            else
            {
                symbol = '-';
                indexNumber = minusIndex;
            }
            string[] numList = formulaStr.Split(mark);
            int numA = int.Parse(formulaStr.Substring(0, indexNumber));
            int numB = int.Parse(formulaStr.Substring(indexNumber + 1, formulaStr.Length - 1 - indexNumber ));
            if (symbol == mark[0])
            {
                Console.WriteLine(numA-numB);
            }
            else
            {
                Console.WriteLine(numA+numB);
            }
        }
    }