using System;                   

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Bai 39:Tính S(n) = CanBac N + 1(N! + CanBacN((N – 1)! + … + CanBac3(2! + CanBac2(1!))) có n dấu căn");

        Console.WriteLine("Nhap vao so n:");

        double n = int.Parse(Console.ReadLine());

        double s=1;

        for(float i=2;i<=n;i++)

        {   double s1=1;

            for(float j =1;j<=i;j++)

            {   s1*=j;

            }   

            s=s1+Math.Pow(s,(float)(1/i));  

        }

        s=Math.Pow(s,(float)(1/(n+1)));

        Console.WriteLine("Ket qua la:{0}",s);

    }

}