#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<utility>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<cassert>
#include<random>
#include<unordered_map>
#include<numeric>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define all(v) (v).begin(),(v).end()
#define stop char nyaa;cin>>nyaa;


using P = pair<int, int>;
using ll = long long;
using LP = pair<ll, ll>;

const ll inf = 1000000007;
const ll INF = inf * inf;






bool isp(int x) {
	int k = sqrt(x + 0.1);
	for (int j = 2; j <= k + 1; j++) {
		if (j != x) {
			if (x%j == 0)return false;
		}
	}
	return true;
}


void solve() {
	int n;
	cin >> n;

	vector<int> anss;
	anss.push_back(1);
	int cur = 100000;
	while (anss.size() < 10) {
		bool valid = true;
		if (isp(cur))valid = false;
		for (int i = 2; i <= 100000; i++) {
			if (cur%i == 0)valid = false;
		}
		if (valid)anss.push_back(cur);
		cur++;
	}
	cout << anss[n - 1] << "\n";
}


signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	//int t; cin >> t;rep(i, t)solve();
	solve();
	stop
	return 0;
}