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/////             Give me AC!!!!            /////
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//↑これじゃ気合いが足りない！
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/////             お願いしますACをくださいそうじゃないと僕泣きますお願いしますACをくださいJudge様....            /////
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#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define rep(i,N) for(int i = 0; i < (N); i++)
#define erep(i,N) for(int i = N - 1; i >= 0; i--)
const ll MOD = 1e9+7;
const ll INF = 1e18;
const int MAX = 200000;
const ld PI = (acos(-1));
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true;} return false;}
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true;} return false;}
ld rad(ld a) {return a * 180 / PI;}
const int dx[8] = {1, 0, -1, 0, -1, 1, -1, 1};//2次元グリッド上のx軸方向
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};//2次元グリッド上のy軸方向
using P = pair<int,int>;
struct UnionFind {
    vector<int> par;
    
    UnionFind(int n) : par(n, -1) { }
 
    int root(int x) {
        if (par[x] < 0) return x;
        else return par[x] = root(par[x]);
    }
    
    bool same(int x, int y) {
        return root(x) == root(y);
    }
    
    bool merge(int x, int y) {
        x = root(x); y = root(y);
        if (x == y) return false;
        if (par[x] > par[y]) swap(x, y); // merge technique
        par[x] += par[y];
        par[y] = x;
        return true;
    }
    
    int size(int x) {
        return -par[root(x)];
    }
};

template <typename T> struct BIT {
private:
    vector<T> array;
    const int n;
public:
    BIT(int _n) : array(_n + 1, 0), n(_n) {}

    T sum(int i) {
        T s = 0;
        while (i > 0) {
            s += array[i];
            i -= i & -i;
        }
        return s;
    }
    T sum(int i,int j) {
        T ret_i = sum(i - 1);
        T ret_j = sum(j);
        return ret_j - ret_i;
    }

    void add(int i,T x) {
        while (i <= n) {
            array[i] += x;
            i += i & -i;
        }
    }
};

map<ll,ll> factorize_list;
 
void factorize(ll k) {
    while(1){
        bool p = true;
        for (ll i = 2; i * i <= k; i++){
            if (k % i == 0){
                factorize_list[i]++;
                k /= i;
                p = false;
                break;
            }
        }
        if(p) {
            factorize_list[k]++;
            break;
        }
    }
    return ;
}
 
ll mod(ll val) {
  ll res = val % MOD;
  if (res < 0) res += MOD;
  return res;
}
 
char upper(char c){
    if('a' <= c && c <= 'z'){
        c = c - ('a' - 'A');
    }
    return c;
}
char lower(char c){
    if('A' <= c && c <= 'Z'){
        c = c + ('a' - 'A');
    }
    return c;
}
 
struct edge{ll to, cost;};

ll fac[MAX], finv[MAX], inv[MAX];

void COMinit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < MAX; i++){
        fac[i] = fac[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
        finv[i] = finv[i - 1] * inv[i] % MOD;
    }
}

// 二項係数計算
ll COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

using Graph = vector<vector<edge>>;

ll Expo(ll N,ll K) {
    //N %= MOD;
    if (K == 0) {
        return 1;
    }
    ll Kc = K,rui = N,ans = 1;
    while(Kc) {
        if (Kc % 2) {
            ans *= rui;
            //ans %= MOD;
        }
        rui *= rui;
        //rui %= MOD;
        Kc /= 2;
    }
    return ans;
}

int dp[100050];

ll XOR(ll a,ll b) {
    return a xor b;
}

signed main(){
    int N;
    cin >> N;
    int cnt = 0;
    vector<ll> prime;
    for (ll i = 100001; cnt < 10; i++) {
        bool hoge = true;
        for (ll j = 2; j * j <= i; j++) {
            if (i % j == 0) {
                hoge = false;
            }
        }
        if (hoge) {
            cnt++;
            prime.push_back(i);
        }
    }
    vector<ll> ans;
    ans.push_back(1);
    for (int i = 0; i < prime.size(); i++) {
        for (int j = i; j < prime.size(); j++) {
            ans.push_back(prime.at(i) * prime.at(j));
        }
    }
    sort(ans.begin(),ans.end());
    cout << ans.at(N - 1) << endl;
    return 0;
}