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()
}