#include <iostream>
#include <vector>
#include <algorithm>
#define int long long
using namespace std;

bool isPrime[200000];
vector<int> ps;

signed main() {
	int n;
	cin >> n;
	if (n == 1) { cout << 1 << endl; return 0; }
	
	int i, j;
	for (i = 0; i < 200000; i++) isPrime[i] = true;
	isPrime[0] = isPrime[1] = false;
	for (i = 2; i < 200000; i++) {
		if (isPrime[i]) {
			for (j = 2 * i; j < 200000; j += i) {
				isPrime[j] = false;
			}
		}
	}
	for (i = 100001; ps.size() < 10; i++) {
		if (isPrime[i]) {
			ps.push_back(i);
		}
	}
	
	vector<int> vec;
	for (i = 0; i < ps.size(); i++) {
		for (j = 0; j < ps.size(); j++) {
			vec.push_back(ps[i] * ps[j]);
		}
	}
	sort(vec.begin(), vec.end());
	
	cout << vec[n - 2] << endl;
	return 0;
}