import java.util.Scanner;

public class Solution {

static int getIntegerComplement(int n) {

String s=Integer.toBinaryString(n);

int lm=0;

for(int i=0;i<s.length();i++){

if(s.charAt(i)=='0'){

lm= (int) (lm+Math.pow(2,s.length()-1-i ));

}

}

return lm;

}

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

int res;

int _n;

_n = Integer.parseInt(in.nextLine());

res = getIntegerComplement(_n);

System.out.println(res);

}

}