

Input

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

Output

Output a single integer.

Example

Input

3


Output

27
import java.io.BufferedReader;
        import java.io.IOException;
        import java.io.InputStreamReader;


public class Main {

    public static void main(String []str) throws IOException{
        BufferedReader l=new BufferedReader(new InputStreamReader(System.in));
        int arr[]={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};
        int t=Integer.parseInt(l.readLine());
        System.out.println(arr[t-1]);

    }
}
