using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = ReadLine();
        var set = new HashSet<string>();
        for (var i = 0; i <= s.Length; ++i)
        {
            for (var c = '0'; c <= '9'; ++c)
            {
                if (i == 0 && c == '0') continue;
                set.Add(s.Insert(i, string.Concat(c)));
            }
        }
        WriteLine(set.Count);
    }
}