import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        if (n == 1) {
            System.out.println(1);
            return;
        }
        n--;
        boolean[] isNotPrimes = new boolean[110000];
        for (int i = 2; i <= 100000; i++) {
            if (!isNotPrimes[i]) {
                for (int j = 2; j * i < 110000; j++) {
                    isNotPrimes[j * i] = true;
                }
            }
        }
        int idx = 100000;
        while (n > 0)  {
            idx++;
            if (!isNotPrimes[idx]) {
                n--;
            }
        }
        System.out.println(idx * 2);
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}