#include <iostream>
using namespace std;
const int MAX = 6000000;
int K;

int factors[MAX + 1];

void Pre_calc() {
	for (int p = 1; p <= MAX; ++p) {
		for (int i = p; i <= MAX; i += p) {
			++factors[i];
		}
	}
}

int main() {
	Pre_calc();

	cin >> K;
	int cnt = 0;
	for (int i = 0; i < MAX; ++i) {
		if (factors[i] == 4) {
			++cnt;
			if (cnt == K) {
				cout << i << endl;
				break;
			}
		}
	}
	return 0;
}