class Program
    {
        static void Main(string[] args)
        {
            char[] mark = { '+', '-' };
            string formulaStr = Console.ReadLine();
            int plusIndex = formulaStr.IndexOf(mark[0],1);
            int minusIndex = formulaStr.IndexOf(mark[1],1);
            var select = SelectionSymbol(plusIndex,minusIndex);

            string[] numList = formulaStr.Split(mark);
            int numA = int.Parse(formulaStr.Substring(0, select.indexNumber));
            int numB = int.Parse(formulaStr.Substring(select.indexNumber + 1, formulaStr.Length - 1 - select.indexNumber ));
            if (select.symbol == mark[0])
            {
                Console.WriteLine(numA-numB);
            }
            else
            {
                Console.WriteLine(numA+numB);
            }
        }

        private static (char symbol, int indexNumber) SelectionSymbol(int plusIndex, int minusIndex)
        {
            if (minusIndex < 0 ||plusIndex != -1 && plusIndex < minusIndex)
            {
                return ('+', plusIndex);
            }
            else
            {
                return ('-', minusIndex);
            }
        }
    }