fun main(args: Array<String>) {
    val (oniPos, oniPerSecond) = readLine()!!.split(" ").map { it.toLong() }
    val (nigePos, nigePerSecond) = readLine()!!.split(" ").map { it.toLong() }
    val time = readLine()!!.toLong()

    if (oniPos <= nigePos) {
        if (oniPos + oniPerSecond * time < nigePos + nigePerSecond * time) {
            println("NO")
        } else {
            println("YES")
        }
    } else {
        if (oniPos + oniPerSecond * time * -1 <= nigePos + nigePerSecond * time * -1) {
            println("YES")
        } else {
            println("NO")
        }
    }
}