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[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    static void Main()
    {
        var n = ReadLine();
        var cnt = n.Count(c => c == '1');
        if (cnt == 2)
        {
            WriteLine("Yes");
            return;
        }
        if (cnt == 1)
        {
            WriteLine("No");
            return;
        }
        for (var i = 0; i + 1 < n.Length; ++i)
        {
            if (n[i] == '0' && n[i + 1] == '1')
            {
                WriteLine("No");
                return;
            }
        }
        WriteLine("Yes");
    }
}