List<string> memory = new List<string> { };

        string display = "";
        while (display.Contains("%") == false)
        {
            string line = ReadLine();
            display = line;
            memory.Add(line);
        }

        float result = float.Parse(memory[0]);

        for (int i = 1; i < memory.Count; i++)
        {
            string temp = memory[i];
            char[] _temp = temp.ToCharArray();
            _temp = _temp.Where(x => x > _temp[0]).ToArray();
            float num = float.Parse(string.Join("", _temp));

            if (temp.Contains("+") == true) result += num;
            else if (temp.Contains("-") == true) result -= num;
            else if (temp.Contains("*") == true) result *= num;
            else if (temp.Contains("/") == true) result /= num;
            else if (temp.Contains("%") == true) result %= num;
        }