Exercise6CalculateSum

using System;
using System.Numerics;

class Exercise6CalculateSum
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Numerics.BigRational x = int.Parse(Console.ReadLine());
        Numerics.BigRational result = 1;
        Numerics.BigRational pow = x;
        Numerics.BigRational factorial = 1;
        for (int i = 1; i <= n; i++)
        {
            factorial = factorial * i;
            result = result + (factorial / pow);
            pow = pow * x;
        }
        Console.WriteLine(result);
    }
}