#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rrep(i, n) for (ll i = n; i > 0; --i)
#define bitrep(i, n) for (ll i = 0; i < (1 << n); ++i)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define yesNo(b) ((b) ? "Yes" : "No")
using ll = long long;
using ull = unsigned long long;
using ld = long double;
string alphabet = "abcdefghijklmnopqrstuvwxyz";
string ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const double pi = 3.141592653589793;
int smallMOD = 998244353;
int bigMOD = 1000000007;

int countSubStr(string src, string sub)
{
    size_t len = src.length();
    int count = 0;
    for (int idx = 0; idx < len; ++count)
    {
        int ret = src.find(sub, idx);
        if (ret == string::npos)
            break;
        idx = ret + 1;
    }
    return count;
}

int main()
{
    string s;
    cin >> s;
    if (count(all(s), '1') == 1)
    {
        cout << "No" << endl;
    }
    else if (count(all(s), '1') == 2)
    {
        cout << "Yes" << endl;
    }
    else
    {
        if (countSubStr(s, "01") == 0)
        {
            cout << "Yes" << endl;
        }
        else
        {
            cout << "No" << endl;
        }
    }
    return 0;
}