// @nuget: CommandLineParser -Version 2.7.82
using System;
public class Program
{
public static void Main()
var p = 5;
var test = ((Factorial(p - 1) + 1) / (p * p));
Console.WriteLine(test);
}
public static int Factorial(int x) =>
x == 1 ? x : x * Factorial(x - 1);