fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n = n.trim();
    let ans =
        if n.match_indices("1").count() == 2 {
            "Yes"
        } else if !n.contains("01") {
            "Yes"
        } else {
            "No"
        };
        println!("{}", ans);
}