import java.util.*

fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
    val a = sc.nextLong()
    val v = sc.nextLong()
    val b = sc.nextLong()
    val w = sc.nextLong()
    val t = sc.nextLong()
    println(problem2020b(a, v, b, w, t))
}

fun problem2020b(A: Long, V: Long, B: Long, W: Long, t: Long): String {
    val diff = Math.abs(A - B)
    val speed = V - W
    if (speed <= 0) return "NO"
    if(t * speed >= diff) return "YES"
    return "NO"
}
