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

namespace Problem_G
{
    class Program
    {
        public static void Term (int N, ref double Sum)
        {
            Sum = 1;
            double fact = 1;
            for (int i = 1; i <= N; i++)
            {
                fact = fact*(1.0/i);
                if (Sum.Equals(double.PositiveInfinity))
                    Console.WriteLine(5);
                Sum += fact;
            }
        }
        static void Main(string[] args)
        {
            double Sum=1;
            int N;
            if (!int.TryParse(Console.ReadLine(), out N) || (N<1))
                Console.WriteLine("wrong");
            else
            {
                Term(N, ref Sum);
                Console.WriteLine(Math.Round(Sum, 5));
            }
        }
    }
}