using System;
using System.Text;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            var sb = new StringBuilder();
            for (var i = 0; i < 5000000; i++)
            {
                sb.Append(i.ToString());
            }
            Console.WriteLine(sb.Length);
        }
    }
}