#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    int N;
    std::cin >> N;

    const int K = 200000;

    std::vector<int> u;
    std::vector<bool> v(K);
    for (int i = 2; i < K; i++) {
        if (v[i] == true) continue;
        if (i > 100000) {
            u.push_back(i);
            if (u.size() > 10) break;
            continue;
        }
        for (int j = i; j < K; j += i) {
            v[j] = true;
        }
    }

    std::vector<int> w = {1};
    for (int i = 0; i < 11; i++) {
        for (int j = i + 1; j < 11; j++) {
            w.push_back(u[i] * u[j]);
        }
    }
    sort(w.begin(), w.end());

    std::cout << w[N - 1] << "\n";
}