#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using vl = vector<ll>;
template<class T> using vc = vector<T>;
template<class T> using vvc = vector<vector<T>>;

#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (ll i = 0; i < (n); i++)
#define repr(i, n) for (ll i = (n)-1; i >= 0; i--)
#define repe(i, l, r) for (ll i = (l); i < (r); i++)
#define reper(i, l, r) for (ll i = (r)-1; i >= (l); i--)
#define repa(i,n) for (auto& i: n)

template<class T> inline bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> inline bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
void init() {cin.tie(0);ios::sync_with_stdio(false);cout << fixed << setprecision(15);}

#ifdef DEBUG
template <class T, class N> void verr(const T& a, const N& n) { rep(i, n) cerr << a[i] << " "; cerr << "\n" << flush; }
ll dbgt = 1; void err() { cerr << "passed " << dbgt++ << "\n" << flush; }
template<class H, class... T> void err(H&& h,T&&... t){ cerr<< h << (sizeof...(t)?" ":"\n") << flush; if(sizeof...(t)>0) err(forward<T>(t)...); }
#endif

const ll INF = 5e18;
const ld EPS = 1e-11;
const ld PI = acos(-1.0L);
const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
//--------------------------------------------------------------------------------//
// 1~1e5までの値について素数:自身の値, 合成数:最小の素因数 の配列を返す
constexpr int PSIZE = 2e5 + 1;
struct eratosthenes_sieve{
    int Primes[PSIZE];
    bool isPrime[PSIZE];
    constexpr eratosthenes_sieve(): Primes(), isPrime(){
        iota(Primes, Primes + PSIZE, 0);
        fill(isPrime, isPrime + PSIZE, 0);
        for (int i = 2; i < PSIZE; i++){
            if (Primes[i] != i) continue;
            for (int s = i * 2; s < PSIZE; s += i){
                Primes[s] = i;
            }
            isPrime[i] = true;
        }
    }
    
    // 数値vの素因数の配列を昇順で取得
    vector<int> get_pfactor(int v){
        vector<int> res;
        int p = Primes[v];
        while(v > 1){
            while (Primes[v] == p) v /= Primes[v];
            res.emplace_back(p);
            p = Primes[v];
        }
        reverse(res.begin(), res.end());
        return res;
    }

    // 数値vの素因数分解を取得
    map<int, int> get_factrization(int v){
        map<int, int> mp;
        while(v>1){
            mp[Primes[v]]++;
            v /= Primes[v];
        }
        return mp;
    }
};
using ES = struct eratosthenes_sieve;

int main() {
    init();
    ll N;
    cin >> N;
    ES es;
    if(N==1){
        cout << 1 << endl;
        return 0;
    }
    N -= 2;

    ll pi = 0;
    vl cand;
    rep(i,PSIZE){
        if (es.Primes[i] <= 100000) continue;
        pi++;
        cand.eb(es.Primes[i]);
        if(pi==10){
            break;
        }
        
    }

    vl ans;
    rep(i,10)repe(j,i,10){
        ans.eb(cand[i] * cand[j]);
    }
    sort(all(ans));


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