Problem 5.Calculate 1 + 1!/X + 2!/X² + … + N!/X^N

Write a program that, for a given two integer numbers n and x, calculates the sum S = 1 + 1!/x + 2!/x² + … + n!/xⁿ. Use only one loop. Print the result with 5 digits after the decimal point.

using System;

class CalculateSuperSum
{
    static void Main()
    {
        int number1 = int.Parse(Console.ReadLine());
        int number2 = int.Parse(Console.ReadLine());
        double result = 1;
        double sum1 = 1;
        double sum2 = 1;
        int num = 1;
        double calc=0;
        for (int index = 1; index <= number1; index++)
        {
            for (int i = 1; i <= num; i++)
            {
                sum1 = sum1 * i;
            }
            for (int i = 1; i <= num; i++)
            {
                if (num == 1)
                {
                    continue;

                }
                sum2 = sum2 * number2;
            }
            num++;
            calc = sum1 / sum2;
            result +=calc;
        }
        Console.WriteLine("{0:0.00000}",result);
        Console.WriteLine("Press Any Key");
        Console.Read();
    }
}