fun main() {
    val distance = readLine()!!.trim().toLong()
    var result = distance
    fun sumDistance(step: Int, d: Long): Long {
        var sum = 0L
        var dist = d
        repeat(step) {
            sum += dist
            dist /= 2
        }
        return sum
    }
    for (step in 2 .. 60) {
        var min = 0L
        var max = distance
        while (min < max) {
            val mid = (min + max) / 2
            val sum = sumDistance(step, mid)
            if (sum < distance) {
                min = mid + 1
            }else {
                max = mid
            }
        }
        if (sumDistance(step, max) == distance) {
            result = minOf(result, max)
        }
    }
    println(result)
}