fun main() {
    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")
    }else{
        val l = Math.abs(A - B)
        val v = V - W
        if(v * T >= l){
            println("YES")
        }else{
            println("NO")
        }
    }
}