#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max()/32*15+208;

vector<int> get_prime(int n){
    if(n <= 1) return vector<int>();
    vector<bool> is_prime(n+1, true);
    vector<int> prime;
    is_prime[0] = is_prime[1] = 0;
    for (int i = 2; i <= n; ++i) {
        if(is_prime[i]) prime.emplace_back(i);
        for (auto &&j : prime){
            if(i*j > n) break;
            is_prime[i*j] = false;
            if(i % j == 0) break;
        }
    }
    return prime;
}

int main() {
    int n;
    cin >> n;
    if(n == 1){
        puts("1");
        return 0;
    }
    auto p = get_prime(100100);
    int cur = 0;
    while(p[cur] <= 100000) cur++;
    vector<ll> v;
    for (int i = cur; i < p.size(); ++i) {
        for (int j = i; j < p.size(); ++j) {
            v.emplace_back((ll)p[i]*p[j]);
        }
    }
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
    cout << v[n-2] << "\n";
    return 0;
}