CalculateIntegerByPowerSbyte_X^Y

using System;
using System.Globalization;
using System.Threading;

class CalculateIntegerByPowerSbyte
{
    static void Main()
    {
        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
        checked
        {
            int numX = int.Parse(Console.ReadLine());
            sbyte powY = sbyte.Parse(Console.ReadLine());
            decimal result = CalculateIntegerXByPowerY(numX, powY);
            Console.WriteLine(result);
        }
    }

    static decimal CalculateIntegerXByPowerY(int numX, sbyte powY)
    {
        /* This method calculated result from integer X by power sbyte Y: (X^Y).
         * He is the best for non-bigger integers for numX and
         * very small whole numbers for power Y.
         * If you must use bigger numbers, you need modify it.
         * Modify return variable (result) type to double or BigInteger,
         * or use System.Math.Pow(numX, powY), wich is too slower! */

        checked
        {
            decimal result = 0;
            if (numX != 0)
            {
                result = 1;
                if (powY > 0)
                {
                    for (int pow = 0; pow < powY; pow++)
                    {
                        result *= numX;
                    }
                }
                else if (powY < 0)
                {
                    powY = Math.Abs(powY);
                    for (int pow = 0; pow < powY; pow++)
                    {
                        result *= numX;
                    }

                    result = 1.0m / result;
                }
            }
            return result;
        }
    }
}