#include <bits/stdc++.h>
using namespace std;

using ll = long long;

class sieve
{
protected:
    int _n;
    std::vector<bool> _f;
public:
    sieve(int n) : _n(n), _f(n+1, true) {
        _f[0] = false;
        _f[1] = false;
        for (int i = 4; i < _f.size(); i+=2)
            _f[i] = false;
        for (int i = 3; i*i < _f.size(); i+=2) {
            if (!_f[i]) continue;
            for (int j = i*i; j < _f.size(); j += i)
                _f[j] = false;
        }
    }
    bool isprime(int x) const { return _f[x]; }
    int size() const { return _n; }
};

int main()
{
    int N; cin >> N;
    if (N == 1) {
        cout << 1 << endl;
        return 0;
    }

    sieve s(1e5+2000);
    vector<int> primes;
    for (int i = 1e5+1; i <= s.size(); i++) {
        if (s.isprime(i)) primes.push_back(i);
        if (primes.size() > 9) break;
    }

    vector<ll> a;
    for (int i = 0; i < primes.size(); i++) {
        for (int j = i; j < primes.size(); j++) {
            a.push_back((ll)primes[i] * primes[j]);
        }
    }
    sort(a.begin(), a.end());

    cout << a[N-2] << endl;    
}