fn get_upper_primes() -> Vec<usize> {
    let mut flgs: Vec<bool> = vec![true; 1_000_001];
    flgs[0] = false;
    flgs[1] = false;
    let mut result: Vec<usize> = vec![];
    for i in 2..=1_000_000 {
        if !flgs[i] { continue; }
        if i > 100_000 {
            result.push(i);
            if result.len() == 9 { break; }
        }
        for j in i..=1_000_000/i {
            flgs[j*i] = false;
        }
    }
    result
}

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

    let mut result: Vec<usize> = vec![];
    result.push(1);
    let cand_bases = get_upper_primes();
    let mut cands: Vec<usize> = vec![];
    for a in cand_bases.iter() {
        for b in cand_bases.iter() {
            let val = a * b;
            if !cands.contains(&val) {
                cands.push(val);
            }
        }
    }
    cands.sort();
    for i in 0..9 {
        result.push(cands[i]);
    }
    println!("{}", result[n-1]);
}