import scala.io.StdIn

object Main extends App {

  val l = StdIn.readLine().split(" ")
  val K = l(0).toInt
  val X = l(1).toInt

  if (impl(K, X)) println("Yes") else println("No")

  def impl(K: Int, X: Int): Boolean = {
    K * 500 >= X
  }
}