import scala.io.StdIn.readLine

object Point445 {
  def main(args:Array[String]): Unit ={
    def pointCalc(n:Double,k:Double):Int =
      (n + n / k).toInt
    val a = readLine().split(" ").map(_.toDouble)
    println(pointCalc(a(0) * 50,0.8 + a(1) * 0.2))
  }
}