using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("1");

        Console.WriteLine("2");

        Console.WriteLine("3");

        Console.WriteLine("4");

        Console.WriteLine("5"); 

        Console.WriteLine("6");

        Console.WriteLine("7");

        Console.WriteLine("8");

        Console.WriteLine("9");

        Console.WriteLine("10");    

        Console.WriteLine("11");

        Console.WriteLine("12");

        Console.WriteLine("13");

        Console.WriteLine("14");

        Console.WriteLine("15");    

        Console.WriteLine("16");

        Console.WriteLine("17");

        Console.WriteLine("18");

        Console.WriteLine("19");

        Console.WriteLine("20");

    }

}