#include <iostream>
#include <string>
#include <algorithm>
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
long long d;
bool solve(long long x) {
	long long co = 0;
	while (x > 0) {
		co += x;
		x /= 2;
		if (co >= d) {
			return true;
		}
	}
	return false;
}
int main() {
	cin >> d;
	long long l = 1, r = 500000000000000100;
	while (r - l > 1) {
		long long m = (l + r) / 2;
		if (solve(m)) {
			r = m;
		}
		else {
			l = m;
		}
	}
	for (long long i = r - 100; i <= r + 100; i++) {
		long long co1 = 0;
		long long i1 = i;
		while (i1 > 0) {
			co1 += i1;
			if (co1 == d) {
				cout << i << endl;
				return 0;
			}
			i1 /= 2;
		}
	}
}