import java.io.BufferedReader import java.io.InputStream import java.io.InputStreamReader import java.io.PrintWriter import java.util.* fun PrintWriter.solve(sc: FastScanner) { val d = sc.nextLong() var min = Long.MAX_VALUE for (num in 1..64) { var l = d / 2 var r = d + 1 while (r - l > 1) { val mid = (l + r) / 2 val v = dist(mid, num) if (v <= d) { l = mid } else { r = mid } } if (dist(l, num) == d) { min = l } } println(min) } fun dist(x:Long, num:Int):Long { var ret = 0L for (i in 0 until num) { ret += x.shr(i) } return ret } fun main() { val writer = PrintWriter(System.out, false) writer.solve(FastScanner(System.`in`)) writer.flush() } class FastScanner(s: InputStream) { private var st = StringTokenizer("") private val br = BufferedReader(InputStreamReader(s)) fun next(): String { while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine()) return st.nextToken() } fun nextInt() = next().toInt() fun nextLong() = next().toLong() fun nextLine() = br.readLine() fun nextDouble() = next().toDouble() fun ready() = br.ready() }