import java.util.Scanner

object biscuits {
  def main(args: Array[String]): Unit = {
    val sc = new Scanner(System.in)
    var n = sc.nextInt
    var count = 0
    while(n != 1) {
      n = n / 2 + n % 2
      count += 1
    }
    println(count)
  }
}