

Input

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

Output

Output a single integer.

Example

Input

3


Output

27
/*package whatever //do not write package name here */

import java.io.*;
import java.util.*;
public class Solution {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] num = new int[] {4,22,27,58,85,94,121,166,202,265,274,319,346,355,378,382,391,438,454,483,517,526,535,562,576,588,627,634,636,645,648,654,663,666,690,706,728,729,762,778,825,852,861,895,913,915,922,958,985,1086,1111,1165};
		int n = sc.nextInt();
		System.out.println(num[n-1]);
	}
}