fn main() {
    let mut ns = String::new();
    std::io::stdin().read_line(&mut ns).ok();
    let ns: Vec<usize> = ns.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = ns[0];
    let s = ns[1];

    let maxval = s;
    let minval = s / n + if s % n > 0 { 1 } else { 0 };
    if 25 <= maxval && minval < 30 {
        println!("Yes");
    } else {
        println!("No");
    }
}