using System;  

  public class program 

   {  

     public static void Main(string[] args)  

      {  

       int i,fact=1,number;      

       Console.Write("Enter a number between 0 and 30:");      

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

       for(i=1;i<=number;i++){      

        fact=fact*i;      

       }      

       Console.Write("Factorial of " +number+" is: "+fact);    

     }  

  }