import java.util.Scanner

object Main {

  def main(args: Array[String]): Unit = {
    val sc = new Scanner(System.in)
    val a = sc.nextLong()
    val v = sc.nextLong()
    val b = sc.nextLong()
    val w = sc.nextLong()
    val t = sc.nextLong()
    if (v < w) {
      println("NO")
    } else {
      val l = Math.abs(b - a)
      val d = t * (v - w)
      if (l > d) {
        println("NO")
      } else {
        println("YES")
      }
    }
  }

}
