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Input

The input contains a single integer a (0 ≤ a ≤ 15).

Output

Output a single integer.

Example

Input


3


Output


13

import java.util.Scanner;

public class MysteryCircuit {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x= scanner.nextInt();
        x^=8;
        if(x>=8) x^=4;
        if(x>=12) x^=2;
        if(x>=14) x^=1;
        System.out.println(x);
    }
}
