fn is_prime(n: usize) -> bool {
    for k in 2.. {
        if k * k > n {
            break;
        }
        if n % k == 0 {
            return false;
        }
    }
    true
}

fn run() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).unwrap();
    let n: usize = s.trim().parse().unwrap();
    if n == 1 {
        println!("1");
        return;
    }
    let mut a = vec![];
    for i in 100001.. {
        if is_prime(i) {
            a.push(i);
        }
        if a.len() >= 10 {
            break;
        }
    }
    let mut b = vec![];
    for x in a.iter() {
        for y in a.iter() {
            b.push(*x * *y);
        }
    }
    b.sort();
    b.dedup();
    println!("{}", b[n - 2]);
}

fn main() {
    run();
}