import scala.io.StdIn

object Problem218 {

  def proc(a: Int, b: Int, c: Int): String = {
    val needItemsInCampaign = Math.ceil(a.toDouble / c)
    val needItemsInNormal = Math.ceil(a.toDouble / b)

    if (needItemsInNormal >= needItemsInCampaign * 1.5) "YES" else "NO"
  }

  def main(args: Array[String]) {
    val a = StdIn.readInt()
    val b = StdIn.readInt()
    val c = StdIn.readInt()

    val result = proc(a, b, c)
    println(result)
  }
}