using System;

public class Program

{

    public static void Main()

    {

        Random randNum = new Random();

        Console.WriteLine("enter a number betwen 10 - 20 ");

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

        for (int i = 1 ; i <= 30 ; i++)

        {

            int n = randNum.Next(10,21);

            if (n == num + 4)

                Console.WriteLine(n);

            if (n == num + 3)

                Console.WriteLine(n);

            if (n == num + 2)

                Console.WriteLine(n);

            if (n == num + 1)

                Console.WriteLine(n);

            if (n == num - 4)

                Console.WriteLine(n);

            if (n == num - 3)

                Console.WriteLine(n);

            if (n == num - 2)

                Console.WriteLine(n);

            if (n == num - 1)

                Console.WriteLine(n);

            if (n == num)

                Console.WriteLine(n);

        }

    }

}