#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

ULL f(ULL D, int t) {
	ULL l = 0, r = 1ull << 61;
	while (l + 1 < r) {
		ULL m = (l + r) / 2;
		ULL mp = m;
		ULL res = 0;
		rep(i, t) { res += mp; mp /= 2; }
		if (res <= D) l = m; else r = m;
	}
	ULL ansv = 0;
	ULL lp = l; rep(i, t) { ansv += lp; lp /= 2; }
	if (ansv == D) return l;
	return ~0ull;
}

int main() {
	ULL D; cin >> D;
	ULL ans = ~0ull;
	rep(i, 64) {
		ULL tmp = f(D, i);
		ans = min(ans, tmp);
	}
	cout << ans << endl;
	return 0;
}