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

namespace Application
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            new MainClass().Calc();
        }

        public MainClass() { }

        public void Calc()
        {
            var r = Console.ReadLine();

            var m = Regex.Match(r, "^([-+]?[0-9]+)([-+])([-+]?[0-9]+)");

            var A = int.Parse(m.Groups[1].Value);
            var op = m.Groups[2].Value;
            var B = int.Parse(m.Groups[3].Value);

            if (op == "+")
                Console.WriteLine(A - B);
            else
                Console.WriteLine(A + B);
        }

        void WriteLine(object o)
        {
            System.Console.WriteLine(o.ToString());
        }

        void WriteEnum<T>(IEnumerable<T> l)
        {
            WriteLine(JoinList(l));
        }

        string JoinList<T>(IEnumerable<T> l)
        {
            return string.Join(" ", l.Select(x => x.ToString()).ToArray());
        }
    }

}