#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<complex>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
using namespace std;
typedef long long ll;
typedef unsigned int ui;
const ll mod = 1000000007;
typedef long double ld;
const ll INF = 1e+14;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef complex<ld> Point;
const ld eps = 1e-8;
const ld pi = acos(-1.0);
typedef pair<ld, ld> LDP;
typedef pair<ll, ll> LP;
#define fr first
#define sc second

const int mn = 5150000;
bool isp[mn+1];
vector<int> c[mn + 1];
vector<int> v;
void init() {
	fill(isp + 2, isp + mn+1, true);
	Rep1(i, 2, mn) {
		if (!isp[i])continue;
		c[i].push_back(i);
		for (int j = 2 * i; j <= mn; j += i) {
			isp[j] = false; c[j].push_back(i);
		}
	}
	Rep1(i, 2, mn) {
		int num = 0; int cop = i;
      if(c[i].size()>2)continue;
		rep(k, c[i].size()) {
			int d = c[i][k];
			while (cop%d==0) {
				cop /= d;
				num++;
				if (num > 3)break;
			}
			if (num > 3)break;
		}
		if (num == 2&&c[i].size()==2)v.push_back(i);
		else if (num == 3 && c[i].size() == 1)v.push_back(i);
	}
}
bool testmincase(int n,int m) {
	if (isp[n])return false;
	vector<bool> used(n, false);
	queue<int> q; q.push(0); used[0] = true;
	rep(i, n) {
		if (isp[i + 1])used[i] = true;
	}
	while (!q.empty()) {
		int id = q.front(); q.pop();
		if (id%m) {
			if (!used[id - 1]) {
				used[id - 1] = true; q.push(id - 1);
			}
		}
		if ((id%m) < m - 1 && id < n - 1) {
			if (!used[id + 1]) {
				used[id + 1] = true; q.push(id + 1);
			}
		}
		if (id - m >= 0) {
			if (!used[id - m]) {
				used[id - m] = true; q.push(id - m);
			}
		}
		if (id + m < n) {
			if (!used[id + m]) {
				used[id + m] = true; q.push(id + m);
			}
		}
	}
	return used[n - 1];
}
void solve() {
	init(); int n; cin >> n;
	cout << v[n-1] << endl;
  //cout<<v.size()<<endl;
}
int main() {
	solve();
	//stop
	return 0;
}