#![allow(dead_code)]
#![allow(non_snake_case)]

macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

use std::collections::HashSet;

fn main() {
    input!{
        n:usize
    }
    if n == 1 {
        println!("{}", 1);
        return
    }
    let mut g = vec![true; 100100];
    for i in 2..400 {
        if g[i] {
            // print!("{} ", i);
            for j in i..100099/i+1 {
                g[j*i] = false;
            }
        }
    }
    let mut f = Vec::new();
    for i in 100000..100100 {
        if g[i] {
            f.push(i);
        }
    }
    let mut g = Vec::new();
    for &x in &f {
        for &y in &f {
            g.push(x * y)
        }
    }
    let uniq: HashSet<usize> = g.into_iter().collect();
    let mut g: Vec<&usize> = uniq.iter().collect();
    g.sort();
    println!("{}", g[n-2]);
}