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

namespace foreach01
{
    class Program
    {
        static void Main(string[] args)
        {
            int item;

            for (item = 1; item < 31; item++)
            {
                if ((item % 10) == 0)
                {
                    Console.WriteLine("{0:D2}", item);
                }
                else
                {
                    Console.Write("{0:D2}  ", item);
                }
                
            }

            Console.ReadKey();
        }
    }
}