using System;
public class Program
{
	public int findFact(int n)
	{
		int i, f = 1;

		for (i = 1; i <= n; i++)
		{
			f = f * i;
		}
		return f;
	}

	public static void Main(string[] args)
	{
		int x, f;

		Console.Write("Enter a number:");
		x = Convert.ToInt32(Console.ReadLine());

		Program obj = new Program();
		f = obj.findFact(x);

		Console.WriteLine("Factorial is:" + f);
	}
}