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 mut limit: u64 = (n as f64).powf(1./3.) as u64 + 1;
    let mut num: u64 = 2;
    let mut prime_count: usize = 0;
    while num <= limit && prime_count != 2 {
        if n % num == 0 {
            n /= num;
            limit = (n as f64).sqrt() as u64 + 1;
            prime_count += 1;
        } else {
            num += num%2 + 1;
        }
    }
    
    if prime_count == 2 && n > 1{
        println!("YES");
    } else {
        println!("NO")
    }
}