using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace For_Example
{
  class Program
  {
    static void Main(string[] args)
    {

	    for (int i=0 ; i<=20 ; i++)
      {
        Console.WriteLine(i);
      }

      Console.ReadKey();

    }
  }
}
