

Input

The input contains a single integer a (1 ≤ a ≤ 30).

Output

Output a single integer.

Example

Input

3


Output

27
import java.io.*;

public class CF784A {
	// https://oeis.org/A006753
	static int[] aa = {
		4, 22, 27, 58, 85,
		94, 121, 166, 202, 265,
		274, 319, 346, 355, 378,
		382, 391, 438, 454, 483,
		517, 526, 535, 562, 576,
		588, 627, 634, 636, 645 };
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		System.out.println(aa[n - 1]);
	}
}
