using System;                   

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Bai 36:Tính S(n) = CanBac2(n! + CanBac2((n-1)! +CanBac2((n – 2)! + … + CanBac2(2!) + CanBac2(1!)))) có n dấu căn");

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

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

        double s=0;

        for(int i =1;i<=n;i++)

        {   int s1 =1;

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

            {   s1*=j;

            }

            s=Math.Sqrt(s1+s);

        }

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

    }

}