1153 Simple Factorial URI Problem Only Solution in C#

using System; 

 class Exercise8

{ 
     static int joy(int n)
     {
         int result=1;
         for(int i=1;i<=n;i++)
         {
             result=result*i;
         }
         return result;
     }
     static void Main()
    
    {
       
        int n=Convert.ToInt32(Console.ReadLine());
       
        int a= joy(n);
        Console.WriteLine(a);
    }
   
}