fun main(args: Array<String>) {
        val (aStart, aSpeed) = readLine()!!.split(' ').map{it.toInt()}
        val (bStart, bSpeed) = readLine()!!.split(' ').map{it.toInt()}
        val time = readLine()!!.toInt()

        if(aSpeed < bSpeed) {
            println("NO")
            return
        }

        if(aStart < bStart) {

            val aPosition = aStart + (aSpeed * time)
            val bPosition = bStart + (bSpeed * time)

            if(aPosition - bPosition >= 0) {
                println("YES")
            } else {
                println("NO")
            }
        } else {
                val aPosition = aStart - (aSpeed * time)
                val bPosition = bStart - (bSpeed * time)

                if(aPosition - bPosition <= 0) {
                    println("YES")
                } else {
                    println("NO")
                }
        }
    }