use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    
    let mut n: u64 = buf.trim().parse().unwrap();
    
    let limit: u64 = (n as f64).sqrt() as u64;
    let mut prime_count: usize = 0;
    let mut num: u64 = 2;
    while num <= limit && n > 1 {
        if prime_count >= 2 {
            println!("YES");
            return;
        }
        if n % num == 0 {
            n /= num;
            prime_count += 1;
        } else {
            num += 1;
        }
    }
    
    println!("NO")
}