//Write a program to generate the Factorial of a Given Number.
using System;
class a
{
        public void getdata(int n)
        {
                int i;
                int fact=1;
                i=1;
                while(i<=n)
                {
                        fact=fact*i;
                        i++;
                }
                Console.WriteLine(fact);
        }
}
class b
{
        public static void Main()
        {
            int n;
            Console.WriteLine("enter number");
            n = Convert.ToInt32(Console.ReadLine());
                a a1=new a();
                a1.getdata(n);
                Console.Read();
        }
}