using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace laba_4
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Введите n,x");
            Calculate(Convert.ToInt32(Console.ReadLine()), Convert.ToDouble(Console.ReadLine()));
            Console.ReadKey();
        }

        static int factorial(int i)
        {
            int result;
            if (i == 1)
                return 1;
            result = factorial(i - 1) * i;
            //Console.WriteLine(result);
            return result;
        }

        public static double Task1(int n)
        {
            double result = (Math.Pow((-1),n))/factorial((n+1));
            //Console.WriteLine(result);
            return result;
        }

        public static double Calculate(int n, double x)
        {
            double sum = 0;
            for (int i = 1; i <= n; i++)
            {
                sum += (Math.Pow((-1),n))/(Math.Pow(x, i) / i);
            }
            sum *= -1;
            Console.WriteLine(sum);
            return sum;
        }
    }
}