Enigmanation2

using System;
using System.Numerics;
namespace Enigmanation
{
    class Program
    {
        static void Main()
        {
            string input = Console.ReadLine();// "(1+9)%6-(7%2)*8=";
            char[] delimiters = new char[] { '(', ')', '=' };
            string[] arr = input.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
            int result = 0;

            string expression = "";
            for (int index = 0; index < arr.Length; index++)
            {
                if (arr[index].Length > 2 && getDigit(arr[index], 0) > 0 &&
                    getDigit(arr[index], arr[index].Length - 1) > 0)
                {
                    result = getResult(arr[index]);

                    if (result < 0)
                    {
                        expression += result.ToString().Replace('-', '&');
                    }
                    else
                    {
                        expression += result.ToString();
                    }
                }
                else
                {
                    expression += arr[index];
                }
            }

            result = getResult(expression);
            Console.WriteLine("{0:F3}", result);
        }
        static int getResult(string str)
        {
            int num;
            if (int.TryParse(str, out num))
            {
                return int.Parse(str);
            }

            char[] operators = new char[] { '+', '-', '*', '%' };
            char[] digits = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '&' };
            string[] numbers = str.Split(operators, StringSplitOptions.RemoveEmptyEntries);
            string[] oper = str.Split(digits, StringSplitOptions.RemoveEmptyEntries);

            if (numbers[0][0] == '&')
            {
                numbers[0] = numbers[0].Replace('&', '-');
            }

            int result = int.Parse(numbers[0]);

            for (int i = 0; i < numbers.Length - 1; i++)
            {
                int a = result;
                if (numbers[i + 1][0] == '&')
                {
                    numbers[i + 1] = numbers[i + 1].Replace('&', '-');
                }
                int b = int.Parse(numbers[i + 1]);
                switch (oper[i])
                {
                    case "+": result = a + b; break;
                    case "-": result = a - b; break;
                    case "*": result = a * b; break;
                    case "%": result = a % b; break;
                }
            }
            return result;
        }
        static int getDigit(string str, int i)
        {
            int digit = 0;
            switch (str[i])
            {
                case '1': digit = 1; break;
                case '2': digit = 2; break;
                case '3': digit = 3; break;
                case '4': digit = 4; break;
                case '5': digit = 5; break;
                case '6': digit = 6; break;
                case '7': digit = 7; break;
                case '8': digit = 8; break;
                case '9': digit = 9; break;
                default: digit = -1; break;
            }
            return digit;
        }
    }
}