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

using namespace std;
using LL = long long;
using ULL = unsigned long long;

LL P[]{
        100003,
        100019,
        100043,
        100049,
        100057,
        100069,
        100103,
        100109,
        100129,
        100151,
        100153,
};

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

    vector<LL> ans;
    ans.push_back(1);

    for (int i = 0; i < 11; i++) {
        for (int j = 0; j < 11; j++) {
            ans.push_back(P[i] * P[j]);
        }
    }
    sort(ans.begin(), ans.end());

    cout << ans[N - 1] << endl;
}