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

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            int n, d=0, e=0, f;
            n = Convert.ToInt32(Console.ReadLine());

            if (n > 99) {
                d = n - 99;
            }
            if (n > 9 && n < 100) {
                e = n - 9;
            }
            f = (d * 3) + (e * 2) + 9;
            Console.WriteLine(f);
            Console.ReadKey();
        }
    }
}