using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var i = getOP(s);
        var a0 = int.Parse(s.Substring(0, i));
        var a1 = int.Parse(s.Substring(i + 1));
        Console.WriteLine(s[i] == '+' ? a0 - a1 : a0 + a1);
    }
    public static int getOP(string s)
    {
        for (int i = 1; i < s.Length; i++)
            if (s[i] == '+' | s[i] == '-') return i;
        return 0;
    }
}