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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 500;
            while (i < 15000)
            {
                Console.Beep(i, 700);
                i += 500;
                
            }
            Console.ReadLine();
        }
    }
}