using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var b = getOP(s);
        var a0 = int.Parse(s.Substring(0, b));
        var a1 = int.Parse(s.Substring(b + 1));
        Console.WriteLine(s[b] == '+' ? a0 - a1: a0 + a1);
    }
    public static int getOP (string s )
    {
        var numbegin = false;
        for (int i = 0; i < s.Length; i++)
        {
            if (isNUM(s[i]) && !numbegin  ) numbegin = true;
            if (!isNUM(s[i]) && numbegin) return i;
        }
        return 0;
    }
    public static bool isNUM (char c) => c != '+'  &&  c != '-';
}