import kotlin.math.*
import java.util.*

const val MOD = 1000000007L

fun readI() = readLine()!!.toInt()
fun readL() = readLine()!!.toLong()
fun readD() = readLine()!!.toDouble()
fun readIs() = readLine()!!.split(' ').map(String::toInt)
fun readLs() = readLine()!!.split(' ').map(String::toLong)
fun readDs() = readLine()!!.split(' ').map(String::toDouble)

fun main(args: Array<String>) {
  val (a, v) = readLs()
  val (b, w) = readLs()
  val t = readL()
  if (w * t + abs(a - b) <= v * t) {
    println("YES")
  } else {
    println("NO")
  }
}
