
fun main(args: Array<String>) {

    val (A, V) = readLine()!!.split(" ").map { it.toLong() }

    val (B, W) = readLine()!!.split(" ").map { it.toLong() }

    val T = readLine()!!.toLong()


    if (W >= V) {
        println("NO")
        return
    }

    var dist = Math.abs(A - B)

    if (T * (V - W) >= dist) {
        print("YES")
    } else {
        print("NO")
    }


}