using System;

public class Program

{

public static void Main()

        {

            int crt = 0;

            for (int i = 0; i < 20; i++)

            {

                int x = int.Parse(Console.ReadLine());

​

                if (x / 1000 != 0 && Math.Abs(x / 1000) < 10)

                {

                    crt++;

                }

            }

            Console.WriteLine("number of numbers that have 4 digits: " + crt);}}