Loops Calculate 1 + 1!/X + 2!/X2 + … + N!/XN

using System;
class CalcFactorilAndPower
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        double power = int.Parse(Console.ReadLine());
        double sum = 1;
        double factorial = 1;
        //double result = 1; може и така да се направи
        double result = 0;
        for (int i = 1; i <= N; i++)
        {
            factorial = factorial * i;
            sum = sum * power;
            result += factorial / sum;
        }
        Console.WriteLine(Math.Round(result,5) + 1);
        //Console.WriteLine(Math.Round(result,5));
    }
}