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#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;

int perevod_obratno(string o) {
	string a = o;
	int j = 0;
	int tmp = 1;
	for (int i = 0; i < size(a); i++){
		if (a[i] == '1') tmp = 0;
		else if (a[i] == '0') tmp = 1;
		j += tmp * pow(2, i);

	}
	return j;
}
int perevod_tuda(int a) {
	string h = "";
	int k = a;
	while (k != 1){
		h += to_string(k % 2);
		k /= 2;
	}
	h += "1";
	return perevod_obratno(h);
}

int main() {
	int a;
	cin >> a;
	cout << perevod_tuda(a);
}