

Input

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

Output

Output a single integer.

Example

Input

3


Output

27
import java.util.*;
import java.io.*;
import java.math.*;
import java.util.regex.*;
public class CF784A
{
	public static void main(String args[])throws Exception
	{
		Scanner sc = new Scanner(System.in);
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		//the code goes here
        int a[] = {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 = Integer.parseInt(br.readLine());
		System.out.println(a[n-1]);
	}
}