using System;

public class Program

{

    public static void Main()

    {

        int n = 50;

        if(n<10)

        {

            Console.WriteLine("n is less than 10");

        }

        else if (n<20)

        {

            Console.WriteLine("n is les than 20");

        }

        else if (n<30)

        {

            Console.WriteLine("n is less than 30");

        }

        else

        {

            Console.WriteLine("n is greater than or equal to 30");

        }

    }

}