#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <math.h>
#include <string.h>
#include <map>
#include <numeric>
#include <random>
#include <queue>
#include <deque>
#include <tuple>
#include <iomanip>
#include <iterator>
#include <functional>

using namespace std;
typedef long long ll;

const int INF = (1 << 30) - 1;
const ll INFLL= (1LL << 61) - 1;
const int MOD = 1000000007;
#define ALL(a) (a).begin(),(a).end()
#define rALL(a) (a).rbegin(),(a).rend()
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)

vector<bool> IsPrime;

void sieve(int max){
  if(max+1 > IsPrime.size()){
    IsPrime.resize(max+1,true);
  }
  IsPrime[0] = false;
  IsPrime[1] = false;

  for(int i=2; i*i<=max; ++i){
    if(IsPrime[i]){
      for(int j=2; i*j<=max; ++j){
        IsPrime[i*j] = false;
      }
    }
  }
}

int main()
{
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  sieve(200000);
  int N;cin>>N;
  vector<ll> ans;
  ans.push_back(1);
  vector<ll> primes;
  int cnt=0;
  for(int i=100001;i<200000;i++){
    if(IsPrime[i]){
      cnt++;
      primes.push_back(i);
      if(cnt==N){
        break;
      }
    }
  }
  REP(i,primes.size()){
    REP(j,primes.size()){
      ans.push_back(primes[i]*primes[j]);
    }
  }
  sort(ALL(ans));
  unique(ALL(ans));
  cout<<ans[N-1]<<endl;
}