use std::io::Read;
fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();

    let mut is_prime = true;
    let mut div = 2;
    while div * div <= n {
        if n % div == 0 {
            is_prime = false;
            break;
        }
        div += 1;
    }
    if !is_prime {
        println!("YES");
    } else {
        println!("NO");
    }
}