import kotlin.math.abs

fun main() {
    val (a,v) = next2Long()
    val (b,w) = next2Long()
    val t = nextInt()
    if (a == b) return println("YES")
    printYesNo ((v-w) * t >= abs(a - b))
}

val sc = java.util.Scanner(System.`in`)
fun next(): String = sc.next()
fun nextInt() = sc.nextInt()
fun next2Int() = Pair(nextInt(), nextInt())
fun next3Int() = Triple(nextInt(),nextInt(), nextInt())
fun nextIntArray(size: Int) = IntArray(size) { nextInt() }
fun nextLong() = sc.nextLong()
fun next2Long() = Pair(nextLong(), nextLong())
fun nextLine(): String = sc.nextLine()
fun nextList() = nextLine().split(" ")
fun printYesNo(isYes: Boolean) = println(if (isYes) "YES" else "NO")
fun printString(action: StringBuilder.()-> Unit) = println(buildString(action))
