import kotlin.math.abs

fun main(args: Array<String>) = tokiomarine2020b()

fun tokiomarine2020b() {
    val (a, v) = readLine()!!.split(' ').map { it.toLong() }
    val (b, w) = readLine()!!.split(' ').map { it.toLong() }
    val t = readLine()!!.toLong()

    val distance = abs(a - b)
    val closePerSec = v - w

    val answer = if (distance <= t * closePerSec) "YES" else "NO"

    println(answer)
}
