fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: u64 = n.trim().parse().unwrap();

    let k = (2. * n as f64).sqrt().floor() as u64;

    if k * (k + 1) == 2 * n {
        println!("YES");
        println!("{k}");
    } else {
        println!("NO");
    }
}