object Problem221 {
  def main(args: Array[String]) {
    val N = scala.io.StdIn.readInt()

    val population = 1000000
    val mafia = N * 100
    val notMafia = population - mafia

    val correctAlert = mafia * 0.99
    val wrongAlert = notMafia * 0.01

    println(100.0 * wrongAlert / (correctAlert + wrongAlert))
  }
}