import kotlin.math.abs

fun main() {
    val builder = StringBuilder()

    val (a, v) = readInputLine().split(" ").map { it.toLong() }
    val (b, w) = readInputLine().split(" ").map { it.toLong() }
    val t = readInputLine().toLong()

    if (w >= v) {
        builder.appendln("NO")
    } else {
        if ((abs(a - b) + (v - w) - 1L) / (v - w) <= t) {
            builder.appendln("YES")
        } else {
            builder.appendln("NO")
        }
    }

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}
