#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <math.h>
#include <complex>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <set>
#include <bitset>
#include <functional>
#include <assert.h>
#include <numeric>

using namespace std;

#define REP(i, m, n) for (int i = (int)(m); i < (int)(n); ++i)
#define rep(i, n) REP(i, 0, n)

using ll = long long;
const int inf = 1e9 + 7;
const ll longinf = 1LL << 60;
const ll mod = 1e9 + 7;

vector<bool> prime_table(int n)
{
    vector<bool> prime(n + 1, true);
    if (n >= 0)
        prime[0] = false;
    if (n >= 1)
        prime[1] = false;
    for (int i = 2; i * i <= n; i++)
    {
        if (!prime[i])
            continue;
        for (int j = i + i; j <= n; j += i)
        {
            prime[j] = false;
        }
    }
    return prime;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    if (n == 1)
    {
        cout << 1 << "\n";
        return 0;
    }

    vector<bool> tb = prime_table(1000000);

    vector<int> prime;
    for (int i = 0; i < tb.size(); i++)
    {
        if (tb[i] == true)
        {
            prime.push_back(i);
        }
    }

    auto ini = lower_bound(prime.begin(), prime.end(), 100000);
    vector<int> prime2;
    for (int i = (ini - prime.begin()); i < (ini - prime.begin()) + n; i++)
    {
        prime2.push_back(prime[i]);
    }

    vector<int> product;
    for (auto e : prime2)
    {
        for (auto e2 : prime2)
        {
            product.push_back(e * e2);
        }
    }
    sort(product.begin(), product.end());
    cout << product[n - 2] << "\n";
}