using System;

namespace Factorielle
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Console.Write ("Saisissez un nombre : ");
			int n = int.Parse(Console.ReadLine());
			
			/***********************************/
			Console.WriteLine("* Version Tant que * ");
			int itq = 1;
			int ftq = 1;
			while(itq <= n)
			{
				ftq *= itq;
				itq++;
			}
			Console.WriteLine(n + "!=" + ftq);
			
			/***********************************/
			Console.WriteLine("* Version Répéter * ");
			int irj = 1;
			int frj = 1;
			do
			{
				frj *= irj;
				irj++;
			}
			while(irj <= n);
			Console.WriteLine(n + "!=" + frj);
			
			/***********************************/
			Console.WriteLine("* Version Pour * ");
			int fpr = 1;
			for(int ipr = 1 ; ipr <= n ; ipr++)
				fpr *= ipr;
			Console.WriteLine(n + "!=" + fpr);
			
		}
	}
}