import scala.math._

object Main extends App {
  val tempList: Seq[Seq[String]] = {
    for(line <- io.Source.stdin.getLines()) yield {
      line.split(' ').toSeq
    }
  }.toSeq

  val aInfo = tempList(0).map(_.toLong)
  val bInfo = tempList(1).map(_.toLong)
  val timeLimit = tempList(2)(0).toLong

  //AとBの速度差: -ならその時点でNO
  val diffSpeed = aInfo(1) - bInfo(1)
  //T秒で縮められる距離
  val diffInSec = diffSpeed*timeLimit
  //AとBの距離
  val distance = abs(aInfo(0) - bInfo(0))

  if(diffInSec >= distance) println("YES")
  else println("NO")
}