import java.util.*;

public class Main {
 	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if (n == 1) {
		    System.out.println(1);
		    return;
		}
		ArrayList<Integer> primes = new ArrayList<>();
		for (int i = 100001; primes.size() < n; i++) {
		    if (isPrime(i)) {
		        primes.add(i);
		    }
		}
		PriorityQueue<Long> queue = new PriorityQueue<>();
		for (int x : primes) {
		    for (int y : primes) {
		        queue.add((long)x * y);
		    }
		}
		for (int i = 0; i < n - 2; i++) {
		    queue.poll();
		}
		System.out.println(queue.poll());
	}
	
	static boolean isPrime(int x) {
	    for (int i = 2; i <= Math.sqrt(x); i++) {
	        if (x % i == 0) {
	            return false;
	        }
	    }
	    return true;
	}
}