using System;      

public class pass_fail

    {  

       public static void Main(string[] args)  

        {  

           int marks; 

           Console.Write("Enter a Marks:");  

           marks = Convert.ToInt32(Console.ReadLine());  

            if (marks < 23)  

            {  

                Console.WriteLine("student is fail.");  

            }  

            else  

            {  

                Console.WriteLine("student is pass");  

            }  

        }  

    }