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);
}