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();
        boolean[] isNotPrimes = new boolean[100100];
        ArrayList<Integer> primes = new ArrayList<>();
        for (int i = 2; i < isNotPrimes.length; i++) {
            if (!isNotPrimes[i]) {
                if (i > 100000) {
                    primes.add(i);
                    if (primes.size() > 10) {
                        break;
                    }
                }
                for (int j = 2; j * i < isNotPrimes.length; j++) {
                    isNotPrimes[j * i] = true;
                }
            }
        }
        ArrayList<Long> ans = new ArrayList<>();
        ans.add(1L);
        for (int x : primes) {
            for (int y : primes) {
                if (x >= y) {
                    continue;
                }
                ans.add((long)x * y);
            }
        }
        Collections.sort(ans);
        System.out.println(ans.get(n - 1));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    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();
    }
    
}