import scala.annotation.tailrec
import scala.io.StdIn.*


def calcPrimeFactor(value: Long): List[(Long, Int)] =
  @tailrec def inner(v: Long, p: Long, e: Int, result: List[(Long, Int)]): List[(Long, Int)] =
    v match
      case 1 =>
        if e == 0 then result else (p, e)::result
      case _ if v % p == 0 => inner(v / p, p, e + 1, result)
      case _ if e != 0 => inner(v, p + 1, 0, (p, e)::result)
      case _ if v < p * p => (v, 1)::result
      case _ => inner(v, p + 1, 0, result)
  inner(value, 2, 0, Nil)


@main def main =
  val Array(x, a, y, b) = readLine().split(' ').map(_.toLong)
  @tailrec def isDividable(x: List[(Long, Int)], y: List[(Long, Int)]): Boolean =
    (x, y) match
      case (_, Nil) => true
      case (Nil, _) => false
      case ((px,ex)::xt, (py, ey)::yt) =>
        if px == py then
          (ex * a) >= (ey * b) && isDividable(xt, yt)
        else
          isDividable(xt, y)
  val xp = calcPrimeFactor(x)
  val yp = calcPrimeFactor(y)
  val result = isDividable(xp, yp)
  println(if result then "Yes" else "No")